The rainbow fish family, also called Melanotaeniidae, belongs to the order of the Fishy ears. 75 species have been scientifically described in 7 types, but new species will be discovered again and again. The natural habitat of the rainbow fish includes the waters of the tropical and subtropical areas of Australia and New Guinea. As the name suggests, the Rainbow fish are known for their dazzling colors and are considered jewels of the freshwater aquarium. The lively schooling fish are depending on the type, up to 12cm tall and prefer a temperature range of 22-28 ° C.