referring more particularly to the drawings , the apparatus for growing living organisms of the present invention is generally indicated by the numeral 10 in fig1 . the apparatus can generally be viewed as having a growing assembly 20 and a lighting assembly 30 . referring first to the growing assembly 20 , it can generally be viewed as having a supply system 40 shown on the right , as viewed in fig2 , and a plurality of growing housings or units 50 . as shown in the drawings , there are twelve ( 12 ) such growing units . more specifically , this is shown in fig1 , 2 , 5 and 6 . as will hereinafter be described in greater detail , the growing assembly 20 of the apparatus 10 can have a greater or lesser number of growing units . the specific number of growing units selected for use in the growing assembly 20 is discretionary and dependent upon the type of living organisms to be grown , the desired production capacity of the apparatus 10 , the preferences as to operation of the apparatus and a variety of other considerations . in the illustrative embodiment shown and described herein , the living organisms are living plants and will hereinafter be referred to as such . the supply system 40 has a main supply housing 60 having a lower supply tank 61 and an upper supply tank 62 . the lower supply tank and upper supply tank are hereinafter referred to , for illustrative convenience , respectively as the lower tank 61 and the upper tank 62 . the upper tank is preferably rested on the lower tank as shown , for example , in fig1 , 2 and 4 . the lower tank and upper tank are preferably , although not necessarily , constructed of a rigid plastic , or similar material , which is sufficiently strong to support the structure of the apparatus and to perform the functions hereinafter described , while being of light weight . the lower tank 61 is best shown in fig6 , 10 , 11 , 12 , 13 and 14 . the lower tank has a floor 70 on which are mounted four ( 4 ) upstanding side walls 71 to form a box like configuration . the floor and upstanding side walls are mounted in fluid tight relation to each other define , or bound , an interior 72 of the lower tank . the side walls have a substantially rectangular upper lip 73 bounding an upper opening 74 . a lid assembly 75 is removably mounted on the upper lip 73 by being press fitted thereon within a downwardly facing groove 76 extending about the periphery of the lid assembly . the lid assembly is composed of a first section 77 and a smaller second section 78 . as shown in fig1 and 13 , the first section 77 has been removed therefrom , leaving the second section 78 in place . for illustrative convenience , the interior 72 is thereby exposed . the interior of the lower tank is perhaps best shown in fig1 in a somewhat enlarged , longitudinal vertical section . the floor 70 has a pair of parallel raised portions or supports 79 extending in across the floor within the interior 72 of the lower tank . the internal operative portions of the apparatus shown in the interior of the lower tank will subsequently be discussed . the upper tank 62 , as heretofore noted , is mounted , or rested , on the lower tank 61 , as shown in fig2 . the upper tank has a floor 90 bounded by four ( 4 ) upstanding side walls extending about the periphery of the floor to form a box like configuration . the floor and upstanding side walls are joined in fluid tight relation to each other to define , or bound , an interior 92 of the upper tank . the side walls of the upper tank have a substantially rectangular upper lip 93 bounding an upper opening 94 . a lid assembly 95 is removably mounted on the upper lip 93 by being press fitted thereon within a groove 96 extending about the periphery of the lid assembly . the lid assembly is composed of a first section 97 and a smaller second section 98 . as shown in fig7 , 8 and 9 , the first section has been pivoted upwardly relative to the second section and while leaving the second section 98 in place . for illustrative convenience the interior 92 of the upper tank 62 is thereby exposed . the floor 90 of the upper tank has a pair of parallel raised portions or supports 99 extending across the floor within the interior 92 of the upper tank . the internal and external operative components of the apparatus will subsequently be discussed . the apparatus 10 of the present invention , as noted , has a plurality of growing units 50 , shown in fig1 , 2 , 5 , 6 , 15 , 16 , 17 and 18 . the specific number of growing units employed in the apparatus can be selected based upon the size of the operation , the yield desired , the preferences of the operator and many other considerations . for illustrative convenience , in the preferred embodiment shown herein , there are twelve ( 12 ) growing units arranged in two rows . the growing units of the two rows are disposed in pairs spaced from each other in side - by - side relation . as shown and described herein , each growing unit in the preferred embodiment has a single plant growing therein . however , if desired , a plurality of plants can be grown in each growing unit . alternatively , the growing units of the second embodiment of the present invention shown in fig1 can be employed , as will hereinafter be described in greater detail . each growing unit 50 has a floor 110 having four ( 4 ) side walls 111 extending upwardly therefrom the form a box like configuration . the floor and upstanding side walls are mounted in fluid tight relation to each other to define , or bound , an interior 112 of the growing unit . the side walls have a substantially rectangular upper lip 113 bounding an upper opening 114 . a lid assembly 115 is removably mounted on the upper lip by being press fitted thereon within a downwardly facing groove 116 extending about the periphery of the lid assembly . the lid assembly is composed of a first section 117 and a smaller second section 118 . the floor 110 has a pair of parallel raised portions or supports 119 extending across the floor within the interior 112 of the growing unit 50 . the first section of the lid assembly has a hole 120 of a predetermined diameter extending therethrough into communication with the interior 112 , as shown in fig1 . the supply system 40 of the apparatus 10 has a first air pump 130 mounted externally of the lower tank 61 and upper tank 62 , as best shown in fig5 . the first air pump is operably connected to the lower tank by two ( 2 ) by first air supply lines 131 which extend from the first air pump , through one of the side walls 71 of the lower tank and into the interior 72 thereof , as best shown in fig1 . two ( 2 ) second air supply lines 132 extend from the first air pump , to the upper tank 62 and through the second section 98 of the lid assembly 95 into the interior 92 through the lid assembly 95 into the interior 92 of the upper tank . each of the first air supply lines and second air supply lines has a fluid seal 133 extending thereabout at the point of extension through the side wall 71 of the lower tank 61 and upper tank 62 . the fluid seals operate to prevent leakage about the first air supply lines and second air supply lines . the first air supply lines extend to interior end portions 134 in the interior of the lower tank 61 . the second air supply lines extend to interior end portions 135 in the interior of the upper tank 62 . the supply system 40 has a second air pump 140 mounted between the two rows of growing units 50 on the right , as viewed in fig5 . a growing unit air supply line 141 extends from the second air pump to each of the first six ( 6 ) growing units 50 on the right as viewed in fig5 ; that is , to the three ( 3 ) growing units on one side of the second air pump and to the three ( 3 ) growing units on the opposite side of the second air pump . each of these six ( 6 ) growing units has a fluid seal 143 through which its respective growing unit air supply line extends into the interior 112 of that growing unit . each of the growing unit air supply lines extends to an interior end portion 144 within its respective growing unit , as shown in fig1 . the supply system 40 has a third air pump 150 mounted between the two rows of growing units 50 on the left , as viewed in fig5 . a growing unit air supply line 151 extends from the third air pump to each of the second six ( 6 ) growing units 50 on the left , as viewed in fig5 ; that is , to the three ( 3 ) growing units on one side of the third air pump and to the three ( 3 ) growing units on the opposite side of the third air pump . each of these six ( 6 ) growing units has a fluid seal 153 through which its respective growing unit air supply line extends to an interior end portion 154 within its respective growing unit , as shown in fig1 . two aeration members 170 are individually mounted on the interior end portions 135 of the second air supply lines 132 within the interior 92 of the upper tank 62 . the aeration members are mounted on the supports 99 and extend in spaced , substantially parallel relation to each other within the interior of the upper tank , as shown in fig9 . two aeration members 170 are individually mounted on the interior end portions 134 of the first air supply lines 131 within the interior 72 of the lower tank 61 . the aeration members are mounted on the supports 79 and extend in spaced , substantially parallel relation to each other within the interior of the lower tank , as shown in fig1 and 14 . one aeration member 170 is mounted on the interior end portions 144 and 154 of the growing unit air supply lines 141 and 151 within the interior 112 of each growing unit 50 . the aeration member of each growing unit is mounted on the supports 119 extending transversely thereof , as shown in fig1 . each of the aeration members 170 has a proximal end portion 171 which is connected in air receiving relation to the interior end portions 135 , 134 and 144 of their respective second air supply lines 132 , first air supply lines 131 and growing unit air supply lines 141 and 151 respectively . each of the aeration members extends to a distal end portion 172 and has an outer surface 173 which , in cross section , forms a trucated pyramidal configuration . the aeration members can be constructed of any suitable material , but preferably are constructed of a lightweight , porous stone such as lava rock . each aeration member has a passage running substantially the length thereof and sealed at the distal end portion 172 thereof so that air is pressurized therewithin and is forced through the outer surface 173 and thus from the aeration member , as will hereinafter be described in greater detail . the upper tank 62 is best shown in fig7 , 8 and 9 . the lower tank 61 is best shown in fig1 . a discharge conduit 180 extends from a proximal end portion 181 within the interior 92 of the upper tank 62 , and in fluid communication therewith , to a distal end portion 182 in fluid communication with the interior 72 of the lower tank 61 . the proximal end portion and the distal end portion of the discharge conduit have fluid seals 183 individually extending thereabout where they extend through the side wall 91 of the upper tank and the side wall 71 of the lower tank 61 . a float valve 190 is mounted on the distal end portion 182 of the discharge conduit 180 within the interior 72 of the lower tank 61 . the float valve has a valve assembly 191 which is operated by a valve arm 192 mounting a float 193 thereon near the end of the valve arm and near the center of the interior 72 of the lower tank 61 . the float and valve arm operate the float valve to close , or shut off , the valve assembly when raised relative thereto and to open the valve assembly to fluid flow therethrough when pivoted downwardly from the closed position shown in fig1 . the valve assembly can , for purposes hereinafter described , be temporarily locked in as closed or opened position . the supply system 40 has a fluid circulation system generally indicated by the numeral 200 in fig5 . the fluid circulation system has a left main conduit 201 which is mounted in fluid tight , fluid receiving relation on the side wall 71 of the lower tank 61 on the left , as viewed in fig4 . the left main conduit is disposed in fluid receiving relation to the interior 72 of the lower tank . a right main conduit 202 is mounted in fluid tight , fluid receiving relation on the side wall of the lower tank 61 on the right , as viewed in fig4 . the right main conduit is disposed in fluid receiving relation to the interior 72 of the lower tank . the left main conduit includes a plurality of left main conduit sections 203 which individually interconnect the lower tank with the nearest growing unit 50 and individually in series with successive growing units in order . the right main conduit includes a plurality of right main conduit sections 204 which individually interconnect the lower tank with the nearest growing unit 50 and individually in series with successive growing units as shown in fig2 and 5 . as shown on the left , as viewed in fig6 , a return conduit assembly 205 interconnects the last left main conduit section 203 and the last right main conduit section 204 in fluid tight , fluid transferring relation . the return conduit assembly has a central connection 206 mounting a main shut off valve 207 . the return conduit assembly has fluid pump 215 which is operably connected to the main shut off valve 207 by a linking conduit 216 . a return conduit 217 has a proximal end 218 and an opposite distal end 219 . the proximal end of the return conduit is connected in fluid receiving relation to the fluid pump 215 . the distal end of the return conduit is disposed in juxtaposition to the lower tank 61 . a fluid dispersal assembly 220 is mounted on the distal end 219 of the return conduit 217 and extends through the adjacent side wall 71 of the lower tank 61 , as best shown in fig1 . the fluid dispersal assembly has an elbow conduit 221 which directly extends through the side wall 71 in fluid tight relation by virtue of a seal 222 extending thereabout . a fluid discharge housing 223 is mounted on the elbow conduit 221 within the interior 72 of the lower tank 61 . the fluid discharge housing is operable to discharge fluid received from the elbow conduit in a splayed pattern in the interior 72 of the lower tank , as shown in fig6 . the apparatus 10 has a nutrient distribution system generally indicated by the numeral 230 in fig1 . the nutrient distribution system has a fluid pump 231 mounted on the floor 70 in the interior 72 of the lower tank 61 . the fluid pump 231 is operable to receive fluid in the interior 72 and pump the fluid through a main nutrient conduit 232 having a proximal end 233 mounted in fluid receiving relation on the fluid pump 231 . the main nutrient conduit 232 has a distal end 234 . the proximal end of the main nutrient conduit extends through the side wall 71 of the lower housing in fluid tight relation by virtue of a seal 235 extending thereabout . a fluid valve 236 is operably mounted on the distal end 234 of the main nutrient conduit . the fluid valve 236 is normally disposed in a closed position to seal the distal end 234 . when desired , however , the fluid valve can be placed in an open position to drain the main nutrient conduit and thereby the entire apparatus 10 , as will hereinafter be described . each of the growing units 50 has a plant housing , or basket , 250 mounted in the hole 120 of the first section 117 of the lid assembly 115 . the plant basket has a bottom panel 251 having a downwardly tapered side wall 252 , as shown in fig1 and 18 . the plant basket has an outwardly extending circular upper lip 253 . the plant basket of each growing unit is received and mounted in the hole 120 by the upper lip of each growing unit resting on the first section 117 of the lid assembly 115 . the tapered side wall and bottom panel have a multiplicity of passages or openings 254 extending therethrough . the tapered side wall and bottom panel 251 bound and thereby define an interior 255 of the plant basket . the interior of the plant basket contains and is substantially filled with a growing medium 256 . in the preferred embodiment , the growing medium is a non - soil material , such as vermiculite , or expanded clay pellets , which absorbs fluids , such as water , nutrients , air , and the like . however , if desired , the growing medium can be soil , a soil and non - soil mixture , or the like . a representative seedling or plant 257 is shown in fig1 , 2 , 3 , 4 , 5 , 15 , 16 , 17 , and 18 growing in the growing medium 256 of each growing unit 50 . it will be understood that any type of plant life or other living organisms can be grown in each growing unit . it will similarly be understood that the plant can be grown from seed planted in each growing unit . the nutrient distribution system 230 includes a plurality of supply conduits 270 each having a proximal end 271 and a distal end 272 . the proximal end 271 of each supply conduit is connected in fluid receiving relation to the main nutrient conduit 232 . the distal end of each supply conduit is connected in fluid supplying relation to a nutrient release member 273 which is made of a porous material . the nutrient release member 273 has a proximal end 274 and a distal end 275 . each nutrient release member is received in the growing medium 256 of its respective growing unit 50 in a substantially vertical attitude with the distal end thereof adjacent to the bottom panel 251 of its respective plant basket and in adjacent spaced relation to its respective plant 257 , as best shown in fig1 . the lighting assembly 30 of the apparatus 10 of the present invention is shown in fig1 , 2 , 3 and 4 . the lighting assembly is suspended above and in spaced relation to the growing assembly 20 . the lighting assembly is aligned with the growing assembly 20 . the lighting assembly is suspended by any suitable means , not shown , in this position . the lighting assembly has a main housing 276 having two ( 2 ) spaced , downwardly projecting light fixtures 277 . the light fixtures are operable downwardly to project ultraviolet light on the plants 257 within the growing units 50 . other types , or combinations , of light can be projected from the light fixtures as desired . the main housing 276 has an air duct 278 interconnecting the light fixtures 277 and extending upwardly to a pair of air vent assemblies 279 operable to release heat developed by the light fixtures during operation . the air vent assemblies can have fans , not shown , therein operable to assist in drawing heated air upwardly toward and through the air vent assemblies for upward release of the heated air . for purposes of describing operation of the apparatus 10 , it will be understood that the upper tank 62 is filled to a pre - selected level therein with a nutrient fluid , not shown . the lower tank 61 is filled , as will be described , with a nutrient fluid 280 to an upper surface or level 281 . similarly , the interior 112 of each growing unit 50 is filled , as will be described , with nutrient fluid 282 to a pre - selected upper surface or level 283 . as shown in fig1 and 18 , during operation each aeration member 170 releases air bubbles 284 into the nutrient fluid within the upper tank 62 , lower tank 61 and each growing unit 50 . a second embodiment of the apparatus 10 of the present invention is generally indicated by the numeral 300 in fig1 . in the second embodiment , only the growing units are different from those of the first embodiment . the growing units of the second embodiment of the apparatus 10 are generally indicated by the numeral 350 . except as hereinafter discussed , the same reference numerals are used with respect to the growing unit 350 as in the case of the growing units 50 of the first embodiment of the invention heretofore set forth . thus , the only difference between the growing units 350 and the growing units 50 are that the growing units 350 have four ( 4 ) holes 120 individually adapted to receive four ( 4 ) plant baskets 250 . in addition , each plant basket of the growing units 350 individually have supply conduits 270 with nutrient release members 273 . still further , each plant basket of each growing unit 350 has a plant 257 individually growing therein . in all other respects , the second embodiment 300 of the present invention is the same as the first embodiment heretofore set forth . the operation of the described embodiments of the subject invention are believed to be clearly apparent and are briefly summarized at this point . reference is first made to the upper tank 62 , best shown in fig7 , 8 and 9 . a specific fluid is described herein purely for illustrative convenience . it will be understood that any desired fluid can be employed depending , in part , on the specific type of living organism to be grown in the growing units 50 . with the first section 97 of the lid assembly 95 disposed in a raised attitude , a fluid , containing the nutrients desired for the stage of development of the plants 257 , is placed , or formed , in the interior 92 of the upper tank 62 . this fluid would , for example , consist of water containing an admixture of nutrients in the quantities desired , such as , for example , molasses , marine bird guano , phosphoric acid , bat guano , calcium nitrate , potassium sulfate and kelp meal . this nutrient fluid can be one already formulated by a commercial supplier , mixed externally of the upper tank , can be mixed , in whole or in part , within the interior of the upper tank , or can be supplied from any other source . in any case , before filling of the interior 92 of the upper tank 62 with this resulting nutrient fluid , the valve assembly 191 of the float valve 190 is placed in a closed position . this permits the desired amount of nutrient fluid to be placed in and / or mixed within the upper tank without draining therefrom through the discharge conduit 180 into the interior 72 of the lower tank 61 . during filling of the interior 92 of the upper tank 62 with the nutrient fluid , the first air pump 130 is operated to supply air from the adjacent environment through the second air supply lines 132 to the two ( 2 ) aeration members 170 within the upper tank , as best shown in fig9 . the air , under pressure , is forced out of the aeration members and introduced to the nutrient fluid in the form of air bubbles 284 . the air bubbles buoyantly pass upwardly in the nutrient fluid within the upper tank thereby aerating the nutrient fluid . this process is continued during the presence of nutrient fluid within the upper tank . the first section 97 of the lid assembly 95 can then be closed to prevent the nutrient fluid from inadvertently being contaminated . however , nutrient fluid is continuously added to the interior of the upper tank as the apparatus 10 is operated as necessary to maintain the desired volume of nutrient fluid within the upper tank as it is consumed . the valve assembly 191 of the float valve 190 is then placed in an opened condition so that the float 193 is free to float and valve arm 192 thus operates the valve assembly in a normal manner . since , at this time , the interior 72 of the lower tank 61 is empty , the float is gravitationally retained in a lowered position thus maintaining the valve assembly 191 in an opened condition . the opening of the valve assembly causes nutrient fluid 280 gravitationally to flow from the upper tank 62 into the interior 72 of the lower tank 61 through the discharge conduit 180 and the float valve 190 . this can best be visualized upon reference to fig1 . the interior of the lower tank is filled with the nutrient fluid to a predetermined upper level 281 thereby causing the float 193 and valve arm 192 to move upwardly to operate the valve assembly 191 so that it is placed in the closed position . the float valve thus maintains the predetermined upper level 281 within the lower tank 61 , as shown in fig1 . the main shut off valve 207 is placed in an opened condition . at this time , the lower tank 61 is filled with nutrient fluid 280 to the predetermined upper level 281 and is maintained in this condition by operation of the float valve 190 . the first air pump 130 pumps ambient air from externally thereof through the first air supply lines 131 into the two ( 2 ) aeration members 170 . this releases air bubbles 284 from the aeration members to pass upwardly through the nutrient fluid 282 therewithin continuously to aerate the nutrient fluid and supply diffused oxygen into the nutrient fluid . nutrient fluid 280 passes , by way of gravity flow , from the interior 72 of the lower tank 61 , through the fluid circulation system 200 along the left main conduit 201 and the right main conduit 202 . as shown best in fig6 , the nutrient fluid is thereby passed through the six ( 6 ) pairs of growing units 50 to maintain a volume of nutrient fluid 282 within each growing unit reaching the upper level 283 thereof , as shown in fig1 . ambient air is pumped through the growing unit 50 air supply lines 141 and 151 by the second air pump 140 and the third air pump 150 . the air is thus pumped into the aeration members 170 from which air bubbles 284 are released into the nutrient fluid 282 so as buoyantly to rise through and supplying diffused oxygen thereto . since nutrient fluid continues to pass along the left and right main conduits 201 and 202 , respectively , through the growing units , a degree of fluid circulation is established in the nutrient fluid within each growing unit . this continues to mix the ingredients within the nutrient fluid as well as to distribute the air bubbles within the nutrient fluid . this , once again , causes continued aeration of the nutrient fluid . as can be seen in fig1 , the upper level 283 of the nutrient fluid 282 within each growing unit 50 is just immediately beneath the bottom panel 251 of that growing unit &# 39 ; s respective plant basket 250 . the fluid circulation causes periodic contact of the nutrient fluid with the bottom panel and the growing medium 256 therewith which , as in the case of vermiculite , or expanded clay pellets , absorbs and retains the aerated nutrient fluid for absorption as needed by the plant 257 . additionally , such aeration and fluid circulation releases vapor of the nutrient fluid above the upper level 283 within the growing unit for absorption for the same purpose by the growing medium . still further , the supply conduits 270 of the nutrient distribution system 230 , under the impetus of the fluid pump 231 , supply nutrient fluid 282 to the individual nutrient release members 273 within the growing medium 256 of each growing unit 50 . as can best be seen upon reference to fig1 , each nutrient release member is vertically oriented within the growing medium of its respective plant basket 250 adjacent to the plant 257 thereof . thus , nutrient fluid is absorbed by the growing medium for consumption by the plant 257 thereof . any of the nutrient fluid not absorbed by the growing medium is released through the openings 254 to drain from the plant basket into the nutrient fluid within the growing unit . as can be visualized upon reference to fig6 , the nutrient fluid 282 passing along the left main conduit 201 and right main conduit 202 reaches and passes into the return conduit assembly 205 . from the return conduit assembly , the nutrient fluid passes , in sequence , through the main shut off valve 207 ; the linking conduit 216 ; the fluid pump 215 ; the return conduit 217 ; the fluid discharge housing 223 ; and , in a spray pattern , back into the interior 72 of the lower tank 61 . the lower tank thus pulls , in effect , the nutrient fluid back into the lower tank . the spray pattern disperses the nutrient fluid about the interior of the lower tank and assists again in mixing the ingredients comprising the nutrient fluid within the lower tank . the nutrient distribution system 230 supplies the nutrient fluid 282 to the respective nutrient release members 273 of the individual growing units 50 . this is achieved through the nutrient distribution system by means of the fluid pump 231 of the lower tank 61 adjacent to the floor 70 thereof into the main nutrient conduit 232 . this can best be visualized upon reference to fig1 . nutrient fluid 282 , under pressure from the fluid pump 231 , is passed through and along the main nutrient conduit 232 from right to left , as viewed in fig5 . at this time , of course , the fluid valve 236 is in a closed condition . the nutrient fluid , under fluid pressure , is passed through the individual supply conduits 270 and into their respective nutrient release members 273 of the individual growing units 50 . the nutrient fluid is emitted by each nutrient release member into the growing medium 256 which absorbs the nutrient fluid for retention until taken in by the plant 257 as it grows . any surplus nutrient fluid leaks from the growing medium , through the openings 254 in each plant basket 250 and drains into the nutrient fluid 282 within each growing unit . the surplus nutrient fluid within the growing units continues to be circulated through the fluid circulation system 200 , as previously discussed . the light fixtures 277 of the main housing 276 of the lighting assembly 30 are operated to provide ultraviolet light for the plants 257 therebelow within the growing units 50 . this permits photosynthesis to take place within the plants as necessary for plant growth . the air duct 278 and air vent assemblies 279 draw off heat produced by the light fixtures so as to avoid damage to the plants and otherwise to provide an optimum growing environment . when the main shut off valve 207 is closed , the nutrient fluid 282 is thus prevented from entering the return conduit 217 and passing back through the return conduit to the interior 72 of the lower tank 61 . return to the interior of the lower tank can only be through the left main conduit 201 and the right main conduit 202 reversing the normal direction of movement therethrough . opening of the fluid valve 236 and continued operation of the fluid pump 231 causes the entire apparatus 10 to be emptied of nutrient fluid through the lower tank 61 , main nutrient conduit 232 and the fluid valve 236 . this may be done for purposes of cleaning the apparatus , mixing and using a different fluid , or for any other desired purpose . it will be understood that all components of the apparatus 10 requiring electrical power for operation are supplied therewith , as necessary , through suitable electrical and control systems , not shown . the second embodiment 300 of the apparatus 10 , shown in fig1 , operates in the same manner heretofore described . the only substantial difference is that the growing unit 350 of the second embodiment each has four ( 4 ) plant baskets 250 individually provided with the supporting systems heretofore described . in both the first embodiment 10 and the second embodiment 300 , the plant baskets 250 are not fastened to their respective growing units 50 and 350 . the plant baskets are simply held in position by gravity with their individual upper lips 253 rested on the first section 117 of the lid assembly 115 of its respective growing unit . consequently , each plant basket can be lifted from its respective growing unit , the growing unit air supply line 141 and supply conduit 270 removed therefrom , the plant thereof removed after completion of their productive lives , or any other intended usage . there are no other removal requirements . similarly , with or without replacement of the growing medium 256 , a new seed or seedling or other living organism can be planted in the growing medium within the plant basket ; the plant basket reinserted , as descried , in its respective growing unit ; and the growing unit air supply line and supply conduit reattached . the apparatus requires no other installation steps . significantly , in the apparatus 10 of the present invention is distinct from the prior art in numerous important respects . this includes , but not limited to , the fact that the nutrient fluid is continuously circulated during operation and thus is not stagnant ; that the nutrient fluid level can be raised or lowered as desired ; and that there is continuous aeration of the nutrient fluid . still further , the employment of an in - line fluid pump produces peripheral negative pressure which moves the nutrient solution , or fluid , to a central control module , that being the lower supply tank 61 . this achieves rapid surface aeration . supplemental dissolved oxygen is individually supplied to each of the growing units 50 by way of the aeration members 170 . thus , a perpetual nutrient cycling system is established for the growing units 50 which , in addition , delivers replenished dissolved oxygen to each of the growing units during operation of the circulatory in - line fluid pump . the underlying manifold interconnects the growing units to enable nutrient solution to be supplied symmetrically beneath the plant roots of the growing units . therefore , the apparatus for growing living of the present invention is capable of producing commercially practical yields of superior quality plant life and other living organisms ; is operable to provide an optimum growing environment ; is operable to provide superior aeration of the fluid provided to the plant life or the like grown therein ; is operable to provide optimum nutrients in a manner most suited to the particular plant life to be grown ; permits modification thereof to accommodate the changing requirements of the plant life throughout its growth and maturation ; can readily be expanded to provide additional capacity or reduced in size to accommodate a particular desired capacity ; is adapted to provide improved operation in a hydroponic system ; and is otherwise entirely successful in achieving its operational objectives . although the invention has been herein shown and described in what is conceived to be the most practical and preferred embodiments , it is recognized that departures may be made therefrom within the scope of the invention which is not to be limited to the illustrative details disclosed .
methods for growing living organisms in a series of growing units , including delivering a fluid by continuous horizontal flow from a source of fluid to each growing unit .