Keyhole Cichlid and Pajama Cardinalfish Compatibility Overview
Keyhole Cichlid 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: Keyhole Cichlid wants 4.0โ7.5 and Pajama Cardinalfish wants 8.1โ8.4. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Keyhole Cichlid | Pajama Cardinalfish | Verdict |
|---|---|---|---|
| Temperature | 70โ82ยฐF | 72โ82ยฐF | โ 72โ82ยฐF |
| pH Range | 4.0โ7.5 | 8.1โ8.4 | โ No overlap |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 4.3 in | 3.5 in | โ Similar |
| Min. Group | 2+ | 3+ | See below |
| Min. Tank Size | 55 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Keyhole Cichlid โ Cleithracara maronii
The Keyhole Cichlid is a popular choice for beginners due to its relatively easy care and peaceful temperament. These fish are known for their distinct keyhole marking and vibrant coloration. They do well in a community tank with other peaceful species, but should be provided with plenty of hiding spots to feel secure.
โ Full Keyhole Cichlid 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 Keyhole Cichlid live with Pajama Cardinalfish?
Generally not recommended. Keyhole Cichlid 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: Keyhole Cichlid wants 4.0โ7.5 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 Keyhole Cichlid and Pajama Cardinalfish together?
A minimum of 55 gallons is recommended for keeping Keyhole Cichlid and Pajama Cardinalfish together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Keyhole Cichlid and Pajama Cardinalfish?
72โ82ยฐF โ inside Keyhole Cichlid's 70โ82ยฐF and Pajama Cardinalfish's 72โ82ยฐF.
Is a Keyhole Cichlid aggressive toward a Pajama Cardinalfish?
Keyhole Cichlid is peaceful and Pajama Cardinalfish is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Keyhole Cichlid 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. |