Compatibility Overview
Corydoras Catfish and Oscar can potentially coexist, but the combination requires careful attention. Some combination of water parameter differences, size mismatch, or temperament issues make this pair challenging. A larger tank (minimum 100 gallons), dense planting, and close monitoring are essential.
| Factor | Corydoras Catfish | Oscar | Verdict |
|---|---|---|---|
| Temperature | 70–79°F | 74–81°F | ✅ 74–79°F |
| pH Range | 6.0–8.0 | 6.0–8.0 | ✅ 6.0–8.0 |
| Temperament | peaceful | aggressive | ❌ Risk |
| Adult Size | 2.5 in | 14 in | ❌ 6× difference |
| Min. Group | 6+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Corydoras Catfish — Corydoras spp.
Armoured bottom-dwelling catfish that are peaceful with all non-aggressive species. Need fine sand substrate to protect delicate barbels.
→ Full Corydoras Catfish care guide
Oscar — Astronotus ocellatus
Intelligent but aggressive cichlids that will eat any fish small enough to fit in their mouth. Require large tanks (75+ gallons) and robust tank mates.
Frequently Asked Questions
Can Corydoras Catfish live with Oscar?
With significant caution and a larger tank. Corydoras Catfish and Oscar can potentially coexist, but the combination requires careful attention. Some combination of water parameter differences, size mismatch, or temperament issues make this pair challenging. A larger tank (minimum 100 gallons), dense planting, and close monitoring are essential.
What tank size do I need for Corydoras Catfish and Oscar together?
A minimum of 100 gallons is recommended for keeping Corydoras Catfish and Oscar together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Corydoras Catfish and Oscar?
74–79°F
Is a Corydoras Catfish aggressive toward a Oscar?
Corydoras Catfish is peaceful and Oscar is aggressive. Narrow temperature overlap (74–79°F) — keeping the tank at exactly 75–78°F is needed for both species.