Cardinal Tetra and Diamond Tetra Compatibility Overview
Cardinal Tetra and Diamond Tetra 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 | Diamond Tetra | Verdict |
|---|---|---|---|
| Temperature | 73โ82ยฐF | 75โ82ยฐF | โ 75โ82ยฐF |
| pH Range | 4.5โ7.0 | 5.5โ7.0 | โ 5.5โ7.0 |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 1.5 in | 2.4 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
Diamond Tetra โ Moenkhausia pittieri
The Diamond Tetra is a popular freshwater fish known for its vibrant colors and peaceful nature. It is well-suited for community tanks and can thrive in a variety of water conditions. With a moderate activity level and a preference for schools, this species is a great addition to any beginner or intermediate aquarist's tank.
Frequently Asked Questions
Can Cardinal Tetra live with Diamond Tetra?
Yes, in a well-planned setup. Cardinal Tetra and Diamond Tetra 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 Diamond Tetra together?
A minimum of 20 gallons is recommended for keeping Cardinal Tetra and Diamond Tetra together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Cardinal Tetra and Diamond Tetra?
75โ82ยฐF โ inside Cardinal Tetra's 73โ82ยฐF and Diamond Tetra's 75โ82ยฐF.
Is a Cardinal Tetra aggressive toward a Diamond Tetra?
Cardinal Tetra is peaceful and Diamond Tetra is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Cardinal Tetra and Diamond Tetra
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. |