Can Oscar live with Bristlenose Pleco?
🟡 CAUTION
Case-by-case. Watch group sizes, tank size, and feeding zones.
Oscar
Astronotus ocellatus
| Adult Size: | 12.0" |
| Temperament: | aggressive |
| Min Tank: | 75 gal |
| Temperature: | 74-81°F |
| pH Range: | 6.0-7.5 |
Bristlenose Pleco
Ancistrus cirrhosus
| Adult Size: | 5.0" |
| Temperament: | peaceful |
| Min Tank: | 30 gal |
| Temperature: | 73-82°F |
| pH Range: | 6.5-7.5 |
Water Parameter Overlap
| Parameter | Oscar | Bristlenose Pleco | Overlap |
|---|---|---|---|
| Temperature | 74-81°F | 73-82°F | 7°F ✓ |
| pH | 6.0-7.5 | 6.5-7.5 | 1.0 ✓ |
Why CAUTION?
Temperament Match: aggressive + peaceful. One aggressive → predation/nipping risk.
⚠️ Size Predation Risk: Oscar (12.0") vs Bristlenose Pleco (5.0"). Large size difference → larger fish may eat smaller fish.
Score: 75.0/100 (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 75+ gallons:
Fluval FX6 Canister Filter — $399.99
High-capacity canister filter for oscar tanks
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.