The Mono Fish, Monodactylus argenteus, also known as the Moon Fish, the Mono, Fingerfish, Silver Moony, and Moonfish, has a distinct diamond shape with a silver body and yellow dorsal fin. The Mono Fish is a prototypical brackish water fish. Juveniles can be kept in freshwater but as they grow and mature they should be kept in higher salinity tanks. They are a great schooling fish, and should be kept in larger groups for the best success rates. They are lively eaters and will eat most prepared foods, carnivorous or herbivorous. The Mono Fish should be reserved for expert aquarists due to their specific water conditions. Though once acclimated to the right salinity levels, the Mono Fish is quite hardy and can live a long time.