Can Harlequin Rasbora Live With Red Terror?

Harlequin Rasbora and Red Terror are NOT compatible tank mates.

Detailed Analysis

Temperature ✓ Compatible

Good temperature overlap at 75–82°F.

pH ✓ Compatible

Good pH overlap at 6.0–7.5.

Size ✗ Not Compatible

Extreme size difference. Red Terror (16") may eat or bully Harlequin Rasbora (2").

Temperament ✗ Not Compatible

Harlequin Rasbora (peaceful) is not compatible with Red Terror (aggressive). Aggression or stress is very likely.

Swim Level ⚠ Use Caution

Both fish occupy the middle level and Red Terror is territorial. Provide plenty of space and hiding spots.

Trait Conflict ✗ Not Compatible

Red Terror is a predator and may eat Harlequin Rasbora.

Important Notes

  • Harlequin Rasbora is a schooling fish and needs at least 6 of its kind.

Tank Requirements

Minimum tank size for this combination: 75 gallons

ParameterHarlequin RasboraRed Terror
Temperature72–82°F75–84°F
pH6–7.56–7.5
Max Size2"16"
TemperamentPeacefulAggressive
Swim LevelMiddleMiddle
Min Tank10 gal75 gal

Check More Combinations

Use our compatibility checker to add more fish and plan your complete tank.