Black Phantom Tetra and Pajama Cardinalfish Compatibility Overview
Black Phantom Tetra and Pajama Cardinalfish 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: Black Phantom Tetra wants 5.0โ7.0 and Pajama Cardinalfish wants 8.1โ8.4. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Black Phantom Tetra | Pajama Cardinalfish | Verdict |
|---|---|---|---|
| Temperature | 68โ82ยฐF | 72โ82ยฐF | โ 72โ82ยฐF |
| pH Range | 5.0โ7.0 | 8.1โ8.4 | โ No overlap |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 1.4 in | 3.5 in | โ ๏ธ 2.5ร difference |
| Min. Group | 8+ | 3+ | See below |
| Min. Tank Size | 55 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Black Phantom Tetra โ Hyphessobrycon megalopterus
The Black Phantom Tetra is a popular freshwater fish known for its striking black and silver coloration. It is generally peaceful and can be kept in a community tank with other non-aggressive species. They require a well-maintained tank with a moderate water flow and a good cover of plants.
โ Full Black Phantom Tetra care guide
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.
Frequently Asked Questions
Can Black Phantom Tetra live with Pajama Cardinalfish?
Generally not recommended. Black Phantom Tetra and Pajama Cardinalfish 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: Black Phantom Tetra wants 5.0โ7.0 and Pajama Cardinalfish wants 8.1โ8.4. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Black Phantom Tetra and Pajama Cardinalfish together?
A minimum of 55 gallons is recommended for keeping Black Phantom Tetra and Pajama Cardinalfish together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Black Phantom Tetra and Pajama Cardinalfish?
72โ82ยฐF โ inside Black Phantom Tetra's 68โ82ยฐF and Pajama Cardinalfish's 72โ82ยฐF.
Is a Black Phantom Tetra aggressive toward a Pajama Cardinalfish?
Black Phantom Tetra is peaceful and Pajama Cardinalfish is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Black Phantom Tetra and Pajama Cardinalfish
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. |