Hailing from the land down under, Australian Rainbowfish are hugely popular due to their beautiful colors and peaceful nature. New species are regularly being discovered and offered for sale in the aquarium trade.Rainbowfish are believed to have evolved from the same evolutionary line as the marine silverside species. In fact, some Rainbowfish species still favor a brackish environment, with some even living in fully marine environments. All species of Rainbowfish have two separate dorsal fins that are narrowly separated. Another distinguishing feature of Rainbowfish is the fact that they lack a lateral line.Most species of Rainbowfish are schooling fish, a fact that is often overlooked by owners. They also enjoy a well-planted habitat (preferably live plants) as well as live foods. In their native habitats, they are known for keeping the mosquito population in check.