Behaviors: Most Rainbowfish are active swimmers and are rarely aggressive, but they do quarrel with each other.
Compatibility: Some recommended tank mates include, other varieties of Rainbowfish, Danios, Barbs, Gouramis, and many other medium-size aquarium fish.
Temperature: Rainbowfish can live pretty well from about 70 to 80 degrees F., but they’re probably most comfortable at about 75 degrees F.
Feeding: Premium Fish Food Flakes when small and Premium Pellet Food when larger.
Water Conditions: Rainbowfish seem to be tolerant of a wide range of water conditions. Probably a pH of about 7 with moderate hardness is best.
Most water in the US has a higher pH and is harder but seems to be OK, so it’s probably best NOT to adjust the pH or the hardness of the water.
Here in our facilities, the water is hard and the pH is usually about 7.8. We ship them in this water.
Aquarium Size: It is probably best to house the fish in at least a 20-gallon tank, but bigger is better. Keep at most one Rainbowfish per 2-gallons, when they’re small.
Larger Rainbowfish need about 4-gallons per Rainbowfish. Huge Rainbowfish need even more water per fish.
Decor: Rainbowfish do not need gravel, and a layer of gravel more than 1/4″ thick will usually fill with bits of uneaten food that will contaminate the water.