Rainbows also relish an occasional feeding of a few live Black Worms and live or frozen brine shrimp. Click here for more about feeding your fish. I feed these Rainbow Fish a few Black Worms every other day. Click here for more about Black Worms. Picture taken in our fish hatchery by The Big Katuna.
All Rainbows prefer to live in a group with at least six members of their species.
Rainbows are often seen in aquariums with livebearers such as Platies , Mollies , and Swordtails , also Armored Corydoras Catfish and a Plecostomus Catfish . Click here to read more about several groups of compatible fish. Size and Life Span. Smaller Rainbow species live a few years, and larger Rainbow species can live for several years. The maximum sizes of the various Rainbow species are given in the table above.