Can Angelfish live with Oscar?
🟡 CAUTION
Case-by-case. Watch group sizes, tank size, and feeding zones.
Angelfish
Pterophyllum scalare
| Adult Size: | 5.9" |
| Temperament: | semi-aggressive |
| Min Tank: | 40 gal |
| Temperature: | 75-82°F |
| pH Range: | 6.5-7.5 |
Oscar
Astronotus ocellatus
| Adult Size: | 12.0" |
| Temperament: | aggressive |
| Min Tank: | 75 gal |
| Temperature: | 74-81°F |
| pH Range: | 6.0-7.5 |
Water Parameter Overlap
| Parameter | Angelfish | Oscar | Overlap |
|---|---|---|---|
| Temperature | 75-82°F | 74-81°F | 6°F ✓ |
| pH | 6.5-7.5 | 6.0-7.5 | 1.0 ✓ |
Why CAUTION?
Temperament Match: semi-aggressive + aggressive. One aggressive → predation/nipping risk.
⚠️ Size Predation Risk: Angelfish (5.9") vs Oscar (12.0"). Large size difference → larger fish may eat smaller fish.
Score: 55.0/100 (CAUTION threshold: GOOD ≥80, CAUTION ≥50, RISKY <50).
🔧 Tank Stocking Calculator
Enter tank size to calculate safe stocking levels:
Recommended Equipment
Based on tank size 40+ gallons:
Fluval Flex Aquarium Kit — $149.99
57-gallon kit suitable for angelfish
Accuracy note: This tool uses expert rules + FishBase.org data. Individual fish behavior varies. Always observe, quarantine new arrivals for 2-4 weeks, and avoid overcrowding.