Can Pajama Cardinalfish and Silver Arowana Live Together?
Can Pajama Cardinalfish and Silver Arowana Live Together? No, not as a long-term shared setup. Pajama Cardinalfish are marine fish, while Silver Arowana are freshwater fish.
| Factor | Pajama Cardinalfish | Silver Arowana | Verdict |
|---|---|---|---|
| Temperature | 72โ82ยฐF | 68โ86ยฐF | โ 72โ82ยฐF |
| pH Range | 8.1โ8.4 | 5.0โ7.5 | โ No overlap |
| Temperament | peaceful | aggressive | โ Risk |
| Adult Size | 3.5 in | 31.5 in | โ 9ร difference |
| Min. Group | 3+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Water Type Makes This Pair Impossible
Pajama Cardinalfish are marine fish, while Silver Arowana are freshwater fish.
A Safer Plan for Pajama Cardinalfish and Silver Arowana
Maintain separate reef and freshwater predator systems.
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
Silver Arowana โ Osteoglossum bicirrhosum
The Silver Arowana is a majestic and unique fish known for its striking appearance and size. It is a large, predatory fish that requires a spacious tank and specific water conditions. While not a community fish, it can be kept with compatible, larger species. They are sensitive to stress and require careful water quality management.
Frequently Asked Questions
Can Pajama Cardinalfish live with Silver Arowana?
No. These species need different water types, so a single aquarium cannot meet both sets of requirements.
What is the biggest risk for Pajama Cardinalfish and Silver Arowana?
Pajama Cardinalfish are marine fish, while Silver Arowana are freshwater fish.
Would a larger tank make Pajama Cardinalfish and Silver Arowana compatible?
More space can reduce some conflict, but it cannot solve incompatible water type, temperature, predation, or core welfare needs.
What is a safer alternative to keeping Pajama Cardinalfish and Silver Arowana together?
Maintain separate reef and freshwater predator systems.
Related Compatibility Guides
Tank size scenarios
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 250 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 350 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 450 gal | Best when keeping larger schools or reducing territorial pressure. |