Can American Flagfish Live With Oscar?
American Flagfish and Oscar are NOT compatible tank mates.
Detailed Analysis
Temperature
✓ Compatible
Good temperature overlap at 74–81°F.
pH
✓ Compatible
Good pH overlap at 6.5–7.5.
Size
✗ Not Compatible
Extreme size difference. Oscar (14") may eat or bully American Flagfish (2.5").
Temperament
✗ Not Compatible
American Flagfish (semi-aggressive) is not compatible with Oscar (aggressive). Aggression or stress is very likely.
Swim Level
⚠ Use Caution
Both fish occupy the middle level and Oscar is territorial. Provide plenty of space and hiding spots.
Trait Conflict
✗ Not Compatible
Oscar is a predator and may eat American Flagfish.
Tank Requirements
Minimum tank size for this combination: 75 gallons
| Parameter | American Flagfish | Oscar |
|---|---|---|
| Temperature | 64–82°F | 74–81°F |
| pH | 6.5–8 | 6–7.5 |
| Max Size | 2.5" | 14" |
| Temperament | Semi-aggressive | Aggressive |
| Swim Level | Middle | Middle |
| Min Tank | 10 gal | 75 gal |
Check More Combinations
Use our compatibility checker to add more fish and plan your complete tank.