How Many Madagascar Rainbowfish in a 125-Gallon Tank?
In a 125-gallon tank you can comfortably keep about 6–19 Madagascar Rainbowfish. As a schooling species, never keep fewer than 6.
Why
Stocking is driven by adult size and waste output, not just fish count. Madagascar Rainbowfish reaches about 5" with a heavy bioload, and needs 68–79°F water at pH 7–8. Always cycle the tank and test water before adding livestock.
| Adult size | 5" |
|---|---|
| Minimum tank | 55 gallons |
| Temperature | 68–79°F |
| pH | 7–8 |
| Temperament | Peaceful |
| Schooling | Yes — group of 6+ |
| Diet | Omnivore |
| Care level | Moderate |
| Origin | Madagascar |
More fish for a 125-gallon tank → Madagascar Rainbowfish tankmates →