Can Jack Dempsey Live With Threadfin Rainbowfish?
Jack Dempsey and Threadfin Rainbowfish are NOT compatible tank mates.
Detailed Analysis
Temperature
✓ Compatible
Good temperature overlap at 75–82°F.
pH
✓ Compatible
Good pH overlap at 6.5–7.5.
Size
✗ Not Compatible
Extreme size difference. Jack Dempsey (10") may eat or bully Threadfin Rainbowfish (1.5").
Temperament
✗ Not Compatible
Jack Dempsey (aggressive) is not compatible with Threadfin Rainbowfish (peaceful). Aggression or stress is very likely.
Swim Level
⚠ Use Caution
Both fish occupy the middle level and Jack Dempsey is territorial. Provide plenty of space and hiding spots.
Trait Conflict
✗ Not Compatible
Jack Dempsey is a predator and may eat Threadfin Rainbowfish.
Important Notes
- Threadfin Rainbowfish is a schooling fish and needs at least 6 of its kind.
Tank Requirements
Minimum tank size for this combination: 63 gallons
| Parameter | Jack Dempsey | Threadfin Rainbowfish |
|---|---|---|
| Temperature | 72–86°F | 75–82°F |
| pH | 6.5–7.5 | 6–7.5 |
| Max Size | 10" | 1.5" |
| Temperament | Aggressive | Peaceful |
| Swim Level | Middle | Middle |
| Min Tank | 55 gal | 15 gal |
Check More Combinations
Use our compatibility checker to add more fish and plan your complete tank.