How Many Ruby Barb in a 40-Gallon Tank?
In a 40-gallon tank you can comfortably keep about 6–20 Ruby Barb. As a schooling species, never keep fewer than 6.
Why
Stocking is driven by adult size and waste output, not just fish count. Ruby Barb reaches about 2.5" with a moderate bioload, and needs 72–79°F water at pH 6–7. Always cycle the tank and test water before adding livestock.
| Adult size | 2.5" |
|---|---|
| Minimum tank | 30 gallons |
| Temperature | 72–79°F |
| pH | 6–7 |
| Temperament | Peaceful |
| Schooling | Yes — group of 6+ |
| Diet | Omnivore |
| Care level | Easy |
| Origin | Sri Lanka |