Cardinal Tetra and Neon Rainbowfish Compatibility Overview
Cardinal Tetra and Neon Rainbowfish can potentially coexist, but the combination requires careful attention. Their usable pH overlap is narrow and requires stable, tested water. A larger tank (minimum 55 gallons), dense planting, and close monitoring are essential.
| Factor | Cardinal Tetra | Neon Rainbowfish | Verdict |
|---|---|---|---|
| Temperature | 73โ82ยฐF | 73โ82ยฐF | โ 73โ82ยฐF |
| pH Range | 4.5โ7.0 | 6.8โ7.5 | โ ๏ธ 6.8โ7.0 (narrow) |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 1.5 in | 3.1 in | โ ๏ธ 2.1ร 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
Neon Rainbowfish โ Melanotaenia praecox
The Neon Rainbowfish, known for its vibrant colors, is a popular addition to freshwater aquariums. These fish are generally peaceful and can be kept in community tanks with other peaceful species. They require a well-maintained tank with a good water flow and plenty of swimming space. Regular water changes and a balanced diet are essential for their health.
Frequently Asked Questions
Can Cardinal Tetra live with Neon Rainbowfish?
With significant caution and a larger tank. Cardinal Tetra and Neon Rainbowfish can potentially coexist, but the combination requires careful attention. Their usable pH overlap is narrow and requires stable, tested water. A larger tank (minimum 55 gallons), dense planting, and close monitoring are essential.
What tank size do I need for Cardinal Tetra and Neon Rainbowfish together?
A minimum of 55 gallons is recommended for keeping Cardinal Tetra and Neon Rainbowfish together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Cardinal Tetra and Neon Rainbowfish?
73โ82ยฐF โ inside Cardinal Tetra's 73โ82ยฐF and Neon Rainbowfish's 73โ82ยฐF.
Is a Cardinal Tetra aggressive toward a Neon Rainbowfish?
Cardinal Tetra is peaceful and Neon Rainbowfish is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Cardinal Tetra and Neon Rainbowfish
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 55 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 75 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. |