Cardinal Tetra and Giant Danio Compatibility Overview
Cardinal Tetra and Giant Danio 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 | Giant Danio | Verdict |
|---|---|---|---|
| Temperature | 73โ82ยฐF | 72โ81ยฐF | โ 73โ81ยฐF |
| pH Range | 4.5โ7.0 | 6.5โ7.5 | โ ๏ธ 6.5โ7.0 (narrow) |
| Temperament | peaceful | semi | โ ๏ธ Monitor |
| Adult Size | 1.5 in | 4.0 in | โ ๏ธ 2.7ร 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
Giant Danio โ Devario aequipinnatus
The Giant Danio is a vibrant and peaceful addition to the freshwater aquarium. Known for its striking red and blue colors, it is a popular choice for beginners and experienced aquarists alike. These fish are relatively easy to care for and can thrive in a well-maintained tank.
Frequently Asked Questions
Can Cardinal Tetra live with Giant Danio?
With significant caution and a larger tank. Cardinal Tetra and Giant Danio 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 Giant Danio together?
A minimum of 55 gallons is recommended for keeping Cardinal Tetra and Giant Danio together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Cardinal Tetra and Giant Danio?
73โ81ยฐF โ inside Cardinal Tetra's 73โ82ยฐF and Giant Danio's 72โ81ยฐF.
Is a Cardinal Tetra aggressive toward a Giant Danio?
Cardinal Tetra is peaceful and Giant Danio is semi. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Cardinal Tetra and Giant Danio
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. |