Can Discus Live With Least Killifish?
Discus and Least Killifish are NOT compatible tank mates.
Detailed Analysis
Temperature
✗ Not Compatible
No temperature overlap. Discus needs 82–88°F, but Least Killifish needs 66–80°F.
pH
✓ Compatible
Good pH overlap at 6.5–7.0.
Size
✗ Not Compatible
Extreme size difference. Discus (8") may eat or bully Least Killifish (1").
Temperament
✓ Compatible
Both fish have compatible temperaments.
Swim Level
✓ Compatible
Fish occupy different water levels (Discus: middle, Least Killifish: top), reducing conflict.
Important Notes
- Discus is a schooling fish and needs at least 5 of its kind.
- Least Killifish is a schooling fish and needs at least 4 of its kind.
Tank Requirements
Minimum tank size for this combination: 58 gallons
| Parameter | Discus | Least Killifish |
|---|---|---|
| Temperature | 82–88°F | 66–80°F |
| pH | 5.5–7 | 6.5–8 |
| Max Size | 8" | 1" |
| Temperament | Peaceful | Peaceful |
| Swim Level | Middle | Top |
| Min Tank | 55 gal | 5 gal |
Check More Combinations
Use our compatibility checker to add more fish and plan your complete tank.