Pajama Cardinalfish and X Ray Tetra Compatibility Overview
Pajama Cardinalfish and X Ray Tetra 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: Pajama Cardinalfish wants 8.1โ8.4 and X Ray Tetra wants 6.0โ7.5. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Pajama Cardinalfish | X Ray Tetra | Verdict |
|---|---|---|---|
| Temperature | 72โ82ยฐF | 72โ82ยฐF | โ 72โ82ยฐF |
| pH Range | 8.1โ8.4 | 6.0โ7.5 | โ No overlap |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 3.5 in | 1.8 in | โ Similar |
| Min. Group | 3+ | 6+ | See below |
| Min. Tank Size | 55 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Pajama Cardinalfish โ Sphaeramia nematoptera
The Pajama Cardinalfish is a popular, beginner-friendly fish that can add a splash of color to your aquarium. They are generally peaceful and can be kept in a community tank. With moderate activity levels and a preference for undisturbed swimming spaces, they require a well-maintained water quality and a spacious tank.
โ Full Pajama Cardinalfish care guide
X Ray Tetra โ Pristella maxillaris
The Pristella maxillaris, also known as the X-Ray Tetra, is a popular freshwater fish known for its unique appearance and peaceful nature. They are slender and iridescent, with a clear, almost x-ray-like body. They are best kept in groups of 6 or more and thrive in well-planted tanks with a moderate water flow.
Frequently Asked Questions
Can Pajama Cardinalfish live with X Ray Tetra?
Generally not recommended. Pajama Cardinalfish and X Ray Tetra 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: Pajama Cardinalfish wants 8.1โ8.4 and X Ray Tetra wants 6.0โ7.5. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Pajama Cardinalfish and X Ray Tetra together?
A minimum of 55 gallons is recommended for keeping Pajama Cardinalfish and X Ray Tetra together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Pajama Cardinalfish and X Ray Tetra?
72โ82ยฐF โ inside Pajama Cardinalfish's 72โ82ยฐF and X Ray Tetra's 72โ82ยฐF.
Is a Pajama Cardinalfish aggressive toward a X Ray Tetra?
Pajama Cardinalfish is peaceful and X Ray Tetra is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Pajama Cardinalfish and X Ray Tetra
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. |