0_Wizard
I build aquariums for a living! I am a hobbyist as well and keep some aquariums at home! How about you?
Small aquariums are kept in the home by hobbyists.
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Aquarium
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Marine aquarium
A marine aquarium is an aquarium that keeps marine plants and animals in a contained environment. Marine aquaria are further subdivided by hobbyists into fish only (FO), fish only with live rock (FOWLR), and reef aquaria. Fish only tanks often showcase large or aggressive marine fish species and generally rely on mechanical and chemical filtration. FOWLR and reef tanks use live rock, a material composed of coral skeletons harboring beneficial nitrogen waste metabolizing bacteria, as a means of more natural biological filtration. Marine fishkeeping is different from its freshwater counterpart because of the fundamental differences in the constitution of saltwater and the resulting differences in the adaptation of its inhabitants.
Aquarium
An aquarium (plural: "aquariums" or "aquaria") is a vivarium of any size having at least one transparent side in which aquatic plants or animals are kept and displayed. Fishkeepers use aquaria to keep fish, invertebrates, amphibians, aquatic reptiles such as turtles, and aquatic plants. The term "aquarium", coined by English naturalist Philip Henry Gosse, combines the Latin root "aqua", meaning water, with the suffix "-arium", meaning "a place for relating to". The aquarium principle was fully developed in 1850 by the chemist Robert Warington, who explained that plants added to water in a container would give off enough oxygen to support animals, so long as the numbers of animals did not grow too large.
World Association of Zoos and Aquariums
The World Association of Zoos and Aquariums (WAZA) is the "umbrella" organisation for the world zoo and aquarium community. Its mission is to provide leadership and support for zoos, aquariums, and partner organizations of the world in animal care and welfare, conservation of biodiversity, environmental education and global sustainability. The organisation is based in Gland, Switzerland. After an earlier International Union of Directors of Zoological Gardens (IUDZG), founded in 1935 at Basel, Switzerland, ceased to exist during World War II, a new IUDZG was founded in Rotterdam in 1946 by a group of zoo directors from allied or neutral countries.
Reef aquarium
A reef aquarium or reef tank is a marine aquarium that prominently displays live corals and other marine invertebrates as well as fish that play a role in maintaining the tropical coral reef environment. A reef aquarium requires appropriately intense lighting, turbulent water movement, and more stable water chemistry than fish-only marine aquaria, and careful consideration is given to which reef animals are appropriate and compatible with each other. Reef aquariums consist of a number of components, in addition to the livestock, including:  Display tank: The primary tank in which the livestock are kept and shown.
Freshwater aquarium
A freshwater aquarium is a receptacle that holds one or more freshwater aquatic organisms for decorative, pet-keeping, or research purposes. Modern aquariums are most often made from transparent glass or acrylic glass. Typical inhabitants include fish, plants, amphibians, and invertebrates, such as snails and crustaceans. Freshwater fish may be either coldwater or tropical species. Although freshwater aquariums can be set up as community tanks, coldwater and tropical fish are generally not mixed due to incompatibilities in temperature requirements. Coldwater aquariums house goldfish and other species that do not require a heating apparatus.
Canada's Accredited Zoos and Aquariums
Canada's Accredited Zoos and Aquariums - CAZA () is an accreditation and advocacy organization representing zoos and aquariums within Canada. The organization states that its member zoos and aquariums care for more than 100,000 individual animals representing over 2000 species of wildlife, observed by an estimated 11 million visitors each year. The organization is a member of the International Union for Conservation of Nature and the World Association of Zoos and Aquariums. The organization was founded in 1975 at a conference of the Association of Zoos and Aquariums (then named the American Association of Zoological Parks and Aquariums).
List of marine aquarium fish species
The following list of marine aquarium fish species commonly available in the aquarium trade is not a completely comprehensive list; certain rare specimens may available commercially yet not be listed here. A brief section on each, with a link to the page about the particular species is provided along with references for further information. These large fish are considered to be quite hardy, but because of their size may present a significant challenge to the keeper. They need huge aquariums, up to 180 gallons to house one for its entire lifespan. Two angels might be kept in the same aquarium provided it is a large aquarium, they are properly acclimated as juveniles, and they have very different colouring and body shape.
1_Apprentice
I don't but I am fascinated by them.  What kind of fish are in your aquarium?