Pajama Cardinalfish and Zebra Danio Compatibility Overview
Pajama Cardinalfish and Zebra Danio 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 Zebra Danio wants 6.5โ8.0. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Pajama Cardinalfish | Zebra Danio | Verdict |
|---|---|---|---|
| Temperature | 72โ82ยฐF | 64โ82ยฐF | โ 72โ82ยฐF |
| pH Range | 8.1โ8.4 | 6.5โ8.0 | โ No overlap |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 3.5 in | 2 in | โ Similar |
| Min. Group | 3+ | 5+ | 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
Zebra Danio โ Danio rerio
Extremely hardy, fast-moving schooling fish tolerant of a wide temperature range. Active top-to-mid swimmers compatible with most community fish.
Frequently Asked Questions
Can Pajama Cardinalfish live with Zebra Danio?
Generally not recommended. Pajama Cardinalfish and Zebra Danio 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 Zebra Danio wants 6.5โ8.0. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Pajama Cardinalfish and Zebra Danio together?
A minimum of 55 gallons is recommended for keeping Pajama Cardinalfish and Zebra Danio together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Pajama Cardinalfish and Zebra Danio?
72โ82ยฐF โ inside Pajama Cardinalfish's 72โ82ยฐF and Zebra Danio's 64โ82ยฐF.
Is a Pajama Cardinalfish aggressive toward a Zebra Danio?
Pajama Cardinalfish is peaceful and Zebra Danio is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Pajama Cardinalfish and Zebra Danio
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. |