Hillstream Loach and Pajama Cardinalfish Compatibility Overview
Hillstream 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. Their pH ranges do not meet: Hillstream Loach wants 6.0โ7.5 and Pajama Cardinalfish wants 8.1โ8.4. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Hillstream Loach | Pajama Cardinalfish | Verdict |
|---|---|---|---|
| Temperature | 68โ75ยฐF | 72โ82ยฐF | โ ๏ธ 72โ75ยฐF (narrow) |
| pH Range | 6.0โ7.5 | 8.1โ8.4 | โ No overlap |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 2.6 in | 3.5 in | โ Similar |
| Min. Group | 4+ | 3+ | See below |
| Min. Tank Size | 40 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Hillstream Loach โ Sewellia lineolata
Sewellia lineolata, known as the Hillstream Loach, is a fascinating species for aquarists. These fish require a well-oxygenated, clear water environment with plenty of hiding spots. With a lifespan of 7 years, they are a long-term commitment. Their olive green color and slender body shape add a unique aesthetic to the tank.
โ Full Hillstream 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 Hillstream Loach live with Pajama Cardinalfish?
Generally not recommended. Hillstream 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. Their pH ranges do not meet: Hillstream Loach wants 6.0โ7.5 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 Hillstream Loach and Pajama Cardinalfish together?
A minimum of 40 gallons is recommended for keeping Hillstream Loach and Pajama Cardinalfish together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Hillstream Loach and Pajama Cardinalfish?
72โ75ยฐF (narrow) โ inside Hillstream Loach's 68โ75ยฐF and Pajama Cardinalfish's 72โ82ยฐF.
Is a Hillstream Loach aggressive toward a Pajama Cardinalfish?
Hillstream Loach is peaceful and Pajama Cardinalfish is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Hillstream 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 | 40 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 55 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 90 gal | Best when keeping larger schools or reducing territorial pressure. |