Cardinal Tetra and Foxface Rabbitfish Compatibility Overview
Cardinal Tetra and Foxface Rabbitfish are generally not recommended to be housed together. One of these is a marine species and the other is not; they cannot share one aquarium. Their pH ranges do not meet: Cardinal Tetra wants 4.5โ7.0 and Foxface Rabbitfish wants 8.1โ8.4. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Cardinal Tetra | Foxface Rabbitfish | Verdict |
|---|---|---|---|
| Temperature | 73โ82ยฐF | 72โ82ยฐF | โ 73โ82ยฐF |
| pH Range | 4.5โ7.0 | 8.1โ8.4 | โ No overlap |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 1.5 in | 9.0 in | โ 6ร difference |
| Min. Group | 6+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
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
Foxface Rabbitfish โ Siganus vulpinus
The Foxface Rabbitfish is a vibrant and peaceful addition to the marine aquarium. With its striking yellow coloration and dark spots, it adds a splash of color to the tank. They are known for their gregarious nature and can be kept in groups of 2-3. This species is suitable for beginners and intermediate aquarists.
Frequently Asked Questions
Can Cardinal Tetra live with Foxface Rabbitfish?
Generally not recommended. Cardinal Tetra and Foxface Rabbitfish are generally not recommended to be housed together. One of these is a marine species and the other is not; they cannot share one aquarium. Their pH ranges do not meet: Cardinal Tetra wants 4.5โ7.0 and Foxface Rabbitfish wants 8.1โ8.4. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Cardinal Tetra and Foxface Rabbitfish together?
A minimum of 100 gallons is recommended for keeping Cardinal Tetra and Foxface Rabbitfish together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Cardinal Tetra and Foxface Rabbitfish?
73โ82ยฐF โ inside Cardinal Tetra's 73โ82ยฐF and Foxface Rabbitfish's 72โ82ยฐF.
Is a Cardinal Tetra aggressive toward a Foxface Rabbitfish?
Cardinal Tetra is peaceful and Foxface Rabbitfish is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Cardinal Tetra and Foxface Rabbitfish
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 125 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 180 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 300 gal | Best when keeping larger schools or reducing territorial pressure. |