Compatibility Overview
Cardinal Tetra and Corydoras Catfish can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges, and neither poses a major aggression risk to the other. A minimum 40-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Cardinal Tetra | Corydoras Catfish | Verdict |
|---|---|---|---|
| Temperature | 73–82°F | 70–79°F | ✅ 73–79°F |
| pH Range | 4.5–7.0 | 6.0–8.0 | ✅ 6.0–7.0 |
| Temperament | peaceful | peaceful | ✅ Compatible |
| Adult Size | 1.5 in | 2.5 in | ✅ Similar |
| Min. Group | 6+ | 6+ | See below |
| Min. Tank Size | 40 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Cardinal Tetra — Paracheirodon axelrodi
Brilliant red-and-blue schooling fish from the Rio Negro. Prefers soft, acidic, warm water — a natural companion for discus.
→ Full Cardinal Tetra care guide
Corydoras Catfish — Corydoras spp.
Armoured bottom-dwelling catfish that are peaceful with all non-aggressive species. Need fine sand substrate to protect delicate barbels.
Frequently Asked Questions
Can Cardinal Tetra live with Corydoras Catfish?
Yes, in a well-planned setup. Cardinal Tetra and Corydoras Catfish can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges, and neither poses a major aggression risk to the other. A minimum 40-gallon tank is recommended to provide adequate territory and water volume for both species.
What tank size do I need for Cardinal Tetra and Corydoras Catfish together?
A minimum of 40 gallons is recommended for keeping Cardinal Tetra and Corydoras Catfish together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Cardinal Tetra and Corydoras Catfish?
73–79°F
Is a Cardinal Tetra aggressive toward a Corydoras Catfish?
Cardinal Tetra is peaceful and Corydoras Catfish is peaceful. No major aggression issues are expected between these species.