Clown Loach and Pajama Cardinalfish Compatibility Overview
Clown Loach 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. The adult size gap creates a meaningful predation risk. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Clown Loach | Pajama Cardinalfish | Verdict |
|---|---|---|---|
| Temperature | 77โ86ยฐF | 72โ82ยฐF | โ 77โ82ยฐF |
| pH Range | 6.0โ7.5 | 8.1โ8.4 | โ No overlap |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 12 in | 3.5 in | โ ๏ธ 3.4ร difference |
| Min. Group | 5+ | 3+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Clown Loach โ Chromobotia macracanthus
Striking striped loach that grows very large. Peaceful with fish but will eat shrimp, snails and tiny fish.
โ Full Clown Loach 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 Clown Loach live with Pajama Cardinalfish?
Generally not recommended. Clown Loach 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. The adult size gap creates a meaningful predation risk. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Clown Loach and Pajama Cardinalfish together?
A minimum of 100 gallons is recommended for keeping Clown Loach and Pajama Cardinalfish together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Clown Loach and Pajama Cardinalfish?
77โ82ยฐF โ inside Clown Loach's 77โ86ยฐF and Pajama Cardinalfish's 72โ82ยฐF.
Is a Clown Loach aggressive toward a Pajama Cardinalfish?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Clown Loach 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 | 100 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 150 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 220 gal | Best when keeping larger schools or reducing territorial pressure. |