Can Blue Tetra Live With Red Devil?
Blue Tetra and Red Devil 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
⚠ Use Caution
Significant size difference (12" vs 2.5"). Red Devil may bully or stress Blue Tetra.
Temperament
✗ Not Compatible
Blue Tetra (semi-aggressive) is not compatible with Red Devil (aggressive). Aggression or stress is very likely.
Swim Level
⚠ Use Caution
Both fish occupy the middle level and Red Devil is territorial. Provide plenty of space and hiding spots.
Trait Conflict
✗ Not Compatible
Red Devil is a predator and may eat Blue Tetra.
Important Notes
- Blue Tetra is a schooling fish and needs at least 6 of its kind.
Tank Requirements
Minimum tank size for this combination: 55 gallons
| Parameter | Blue Tetra | Red Devil |
|---|---|---|
| Temperature | 73–82°F | 75–82°F |
| pH | 6–7.5 | 6.5–7.5 |
| Max Size | 2.5" | 12" |
| Temperament | Semi-aggressive | Aggressive |
| Swim Level | Middle | Middle |
| Min Tank | 20 gal | 55 gal |
Check More Combinations
Use our compatibility checker to add more fish and plan your complete tank.