How Many Congo Tetra in a 40-Gallon Tank?
In a 40-gallon tank you can comfortably keep about 6–13 Congo Tetra. As a schooling species, never keep fewer than 6.
Why
Stocking is driven by adult size and waste output, not just fish count. Congo Tetra reaches about 3" with a moderate bioload, and needs 73–82°F water at pH 6–7.5. Always cycle the tank and test water before adding livestock.
| Adult size | 3" |
|---|---|
| Minimum tank | 30 gallons |
| Temperature | 73–82°F |
| pH | 6–7.5 |
| Temperament | Peaceful |
| Schooling | Yes — group of 6+ |
| Diet | Omnivore |
| Care level | Moderate |
| Origin | Congo basin |