Pajama Cardinalfish and Red Eye Tetra Compatibility Overview
Pajama Cardinalfish and Red Eye Tetra 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 Red Eye Tetra wants 6.0โ8.0. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Pajama Cardinalfish | Red Eye Tetra | Verdict |
|---|---|---|---|
| Temperature | 72โ82ยฐF | 72โ79ยฐF | โ 72โ79ยฐF |
| pH Range | 8.1โ8.4 | 6.0โ8.0 | โ No overlap |
| Temperament | peaceful | semi | โ ๏ธ Monitor |
| Adult Size | 3.5 in | 2.8 in | โ Similar |
| Min. Group | 3+ | 6+ | 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
Red Eye Tetra โ Moenkhausia sanctaefilomenae
The Red Eye Tetra is a popular freshwater fish known for its vibrant red eyes and sleek, silver body. They are generally peaceful and can be kept in a community tank with other non-aggressive species. Their moderate activity level makes them suitable for a variety of aquarium setups. With proper care, they can live up to 5 years.
Frequently Asked Questions
Can Pajama Cardinalfish live with Red Eye Tetra?
Generally not recommended. Pajama Cardinalfish and Red Eye Tetra 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 Red Eye Tetra wants 6.0โ8.0. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Pajama Cardinalfish and Red Eye Tetra together?
A minimum of 55 gallons is recommended for keeping Pajama Cardinalfish and Red Eye Tetra together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Pajama Cardinalfish and Red Eye Tetra?
72โ79ยฐF โ inside Pajama Cardinalfish's 72โ82ยฐF and Red Eye Tetra's 72โ79ยฐF.
Is a Pajama Cardinalfish aggressive toward a Red Eye Tetra?
Pajama Cardinalfish is peaceful and Red Eye Tetra is semi. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Pajama Cardinalfish and Red Eye Tetra
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. |