Cardinal Tetra and Pearl Danio Compatibility Overview
Cardinal Tetra and Pearl Danio 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 | Pearl Danio | Verdict |
|---|---|---|---|
| Temperature | 73โ82ยฐF | 72โ79ยฐF | โ 73โ79ยฐF |
| pH Range | 4.5โ7.0 | 6.5โ7.5 | โ ๏ธ 6.5โ7.0 (narrow) |
| 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
Pearl Danio โ Danio albolineatus
The Pearl Danio is a popular freshwater fish known for its shimmering blue and white colors. It is a peaceful community fish that can be kept in a tank with other peaceful species. These fish are moderately active and do not require a large tank. They are suitable for beginners due to their hardiness and ease of care.
Frequently Asked Questions
Can Cardinal Tetra live with Pearl Danio?
Yes, in a well-planned setup. Cardinal Tetra and Pearl Danio 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 Pearl Danio together?
A minimum of 20 gallons is recommended for keeping Cardinal Tetra and Pearl Danio together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Cardinal Tetra and Pearl Danio?
73โ79ยฐF โ inside Cardinal Tetra's 73โ82ยฐF and Pearl Danio's 72โ79ยฐF.
Is a Cardinal Tetra aggressive toward a Pearl Danio?
Cardinal Tetra is peaceful and Pearl Danio is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Cardinal Tetra and Pearl Danio
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. |