How Many Serpae Tetra in a 125-Gallon Tank?
In a 125-gallon tank you can comfortably keep about 6–86 Serpae Tetra. As a schooling species, never keep fewer than 6.
Why
Stocking is driven by adult size and waste output, not just fish count. Serpae Tetra reaches about 1.8" with a moderate bioload, and needs 72–79°F water at pH 5–7.5. Always cycle the tank and test water before adding livestock.
| Adult size | 1.8" |
|---|---|
| Minimum tank | 20 gallons |
| Temperature | 72–79°F |
| pH | 5–7.5 |
| Temperament | Semi-aggressive |
| Schooling | Yes — group of 6+ |
| Diet | Omnivore |
| Care level | Easy |
| Origin | Amazon and Paraguay basins |