Pajama Cardinalfish and Tiger Barb Compatibility Overview
Pajama Cardinalfish and Tiger Barb 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 Tiger Barb wants 6.0โ8.0. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Pajama Cardinalfish | Tiger Barb | Verdict |
|---|---|---|---|
| Temperature | 72โ82ยฐF | 68โ79ยฐF | โ 72โ79ยฐF |
| pH Range | 8.1โ8.4 | 6.0โ8.0 | โ No overlap |
| Temperament | peaceful | semi | โ ๏ธ Monitor |
| Adult Size | 3.5 in | 2.75 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
Tiger Barb โ Puntigrus tetrazona
Striking striped barbs that are notorious fin-nippers. Must be kept in groups of 6+ to redirect aggression within the school. Incompatible with long-finned fish.
Frequently Asked Questions
Can Pajama Cardinalfish live with Tiger Barb?
Generally not recommended. Pajama Cardinalfish and Tiger Barb 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 Tiger Barb wants 6.0โ8.0. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Pajama Cardinalfish and Tiger Barb together?
A minimum of 55 gallons is recommended for keeping Pajama Cardinalfish and Tiger Barb together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Pajama Cardinalfish and Tiger Barb?
72โ79ยฐF โ inside Pajama Cardinalfish's 72โ82ยฐF and Tiger Barb's 68โ79ยฐF.
Is a Pajama Cardinalfish aggressive toward a Tiger Barb?
Pajama Cardinalfish is peaceful and Tiger Barb is semi. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Pajama Cardinalfish and Tiger Barb
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. |