One of the more beautiful, striking Rainbowfish species, Melanotaenia splendida is also one of the most variable. The overall body colouration of mature fish is silver, with black or blue lines, and a bright orange or red tail. Like most rainbowfish, these fish will not develop much colouration until they are 6-12 months of age.
An active, schooling fish, Splendid Rainbowfish should be kept in large groups, with a minimum of six fishes. They are unaggressive, and can be mixed with virtually any other community type fishes. They should not be mixed with large cichlids, or othe fish which may eat them. They make excellent dither or target fish for smaller, moderately aggressive cichlids, such as Pelvicachromis. Their bright colouration can also make them a focal point in a planted aquarium.
Care should be taken when mixing similar species of Melanotaenia, as they may hybridise in the aquarium.