Cardinal Tetra and Corydoras Compatibility Overview
Cardinal Tetra and Corydoras Catfish can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges. Both species are peaceful, and neither poses a major aggression risk to the other. A minimum 20-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Cardinal Tetra | Corydoras Catfish | Verdict |
|---|---|---|---|
| Temperature | 73โ82ยฐF | 70โ79ยฐF | โ 73โ79ยฐF |
| pH Range | 4.5โ7.0 | 6.0โ8.0 | โ 6.0โ7.0 |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 1.5 in | 2.5 in | โ Similar |
| Min. Group | 6+ | 6+ | See below |
| Min. Tank Size | 20 gallons (for both species) | โ | |
Compatibility Positives
Caution Points
Species Profiles
Cardinal Tetra โ Paracheirodon axelrodi
Brilliant red-and-blue schooling fish from the Rio Negro. Prefers soft, acidic, warm water โ a natural companion for discus.
โ Full Cardinal Tetra care guide
Corydoras Catfish โ 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. Both species are peaceful, and neither poses a major aggression risk to the other. A minimum 20-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 20 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?
73โ79ยฐF โ inside Cardinal Tetra's 73โ82ยฐF and Corydoras Catfish's 70โ79ยฐF.
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.
Related Compatibility Guides
Tank Size for Cardinal Tetra and Corydoras
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 20 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 29 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 55 gal | Best when keeping larger schools or reducing territorial pressure. |