Can bettas live with harlequin rasboras?
✅ Compatible Yes
- No conflicts found: temperature, pH, size, temperament and fin-nipping checks all pass.
| Betta fish | Harlequin rasbora | |
| Temperature | 72–86 °F (22–30 °C) | 70–82 °F (21–28 °C) |
| pH | 6–8 | 5–7.5 |
| Adult size | 2.8 in (7 cm) | 2.0 in (5 cm) |
| Temperament | Semi-aggressive | Peaceful |
| Swims in | Top | Middle |
| Minimum tank | 10 gal | 20 gal |
Shared temperature: 72–82 °F (22–28 °C) · Shared pH: 6–7.5
Tips if you keep them together
- Keep only one betta fish (or one male).
- Keep harlequin rasboras in a group of at least 6.
- Use a tank of at least 20 US gallons with plenty of plants and hiding places.
- Set the heater around 77 °F (25 °C), the middle of the shared range.
See all betta fish tank mates and harlequin rasbora tank mates, or add more species in the checker.
FAQ
Can bettas live with harlequin rasboras?
Yes. Bettas and harlequin rasboras share water conditions and temperament.
What temperature for bettas and harlequin rasboras?
Betta fish: 72–86 °F (22–30 °C). Harlequin rasbora: 70–82 °F (21–28 °C). Shared range: 72–82 °F (22–28 °C).
What size tank for bettas and harlequin rasboras?
At least 20 US gallons, more as you add fish.
Note: Compatibility depends on individual temperament, tank size, decor and how fish are introduced. Our verdicts use conservative rules applied to published care data (see methodology). They are guidance, not a guarantee. Quarantine new fish and watch for chasing, torn fins or hiding.