This is another version of that. This is a sea dragon, and the one on the bottom, the blue one, is a juvenile that has not yet swallowed the acid, has not yet taken in the brown-green algae pond scum into its body to give it energy.
Toto je jiná verze stejného principu. Řasovník rozedraný. A to modré dole je mladší jedinec, který ještě nepozřel kyselinu, hnědozelenou řasu ze jezerního dna, z níž lze získat energii.