Rainbowfish are a family of beautifully colored freshwater fish. No substrate is necessary. Pictured below, Davies Creek is in the mountains about 80 kilometres north west of Cairns, in far North Queensland. Rainbowfish are a family of beautifully colored freshwater fish. In appearance it looks like a red form of Inornata. Melanotaenia trifasciata [Running Creek, Weipa] - photo© Gunther Schmida. Most information is mainly based on aquarium observations. You need JavaScript enabled to view it. At a public aquarium exhibition, where they made their first public appearance, the cover glass was glued to the aquarium proper so that no one would be able to steal them. These pictures ore of the blue colour morph. Notify me when this product is in stock . Males are deeper bodied than females and the overall colour pattern of males is more intense. In tropical waters, which have prevailing high temperatures, fish generally grow faster, mature younger, and have a shorter life span than fish in temperate waters. Pin Share Email Ko Hungyu / Eyeem / Getty Images.