Species Profile
Australian Rainbowfish
Melanotaenia fluviatilis
Rainbowfishpeaceful
Adult size
4″
Minimum tank
40 gal
Temperature
72–80°F
pH
6.5–8
Schooling
Group of 6+
Water level
mid
Diet
Flake, pellets, frozen
Notes
Colors develop with age and good diet; males display vivid blue, green, and orange when mature in 4+ year-old fish. Hardy and adaptable; great choice for outdoor ponds in warm climates as well as community tanks.
Photo: Bahudhara / Wikimedia Commons · Source · CC-BY-SA-3.0