Cardinal Tetra and Denison Barb Compatibility Overview
Cardinal Tetra and Denison Barb can potentially coexist, but the combination requires careful attention. Their pH ranges overlap only partly, so aim for the shared band and keep it steady. A larger tank (minimum 55 gallons), dense planting, and close monitoring are essential.
| Factor | Cardinal Tetra | Denison Barb | Verdict |
|---|---|---|---|
| Temperature | 73โ82ยฐF | 59โ77ยฐF | โ 73โ77ยฐF |
| pH Range | 4.5โ7.0 | 6.5โ7.8 | โ ๏ธ 6.5โ7.0 (narrow) |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 1.5 in | 4.3 in | โ ๏ธ 2.9ร difference |
| Min. Group | 6+ | 6+ | See below |
| Min. Tank Size | 55 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
Denison Barb โ Sahyadria denisonii
The Denison Barb is a popular freshwater fish known for its vibrant coloration and peaceful nature. It is well-suited for community tanks with other peaceful species. These fish are relatively easy to care for and can thrive in a well-maintained aquarium. They require a spacious tank and should be kept in groups to prevent stress.
Frequently Asked Questions
Can Cardinal Tetra live with Denison Barb?
With significant caution and a larger tank. Cardinal Tetra and Denison Barb can potentially coexist, but the combination requires careful attention. Their pH ranges overlap only partly, so aim for the shared band and keep it steady. A larger tank (minimum 55 gallons), dense planting, and close monitoring are essential.
What tank size do I need for Cardinal Tetra and Denison Barb together?
A minimum of 55 gallons is recommended for keeping Cardinal Tetra and Denison Barb together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Cardinal Tetra and Denison Barb?
73โ77ยฐF โ inside Cardinal Tetra's 73โ82ยฐF and Denison Barb's 59โ77ยฐF.
Is a Cardinal Tetra aggressive toward a Denison Barb?
Cardinal Tetra is peaceful and Denison Barb is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Cardinal Tetra and Denison Barb
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 64 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 90 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 125 gal | Best when keeping larger schools or reducing territorial pressure. |