Overview
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.
Scientific Classification
| Rank | Classification |
|---|---|
| Family | Apogonidae |
| Genus | Sphaeramia |
| Species | Sphaeramia nematoptera |
| Water type | saltwater |
Natural Habitat
Native to the Pacific Ocean, Sphaeramia nematoptera is commonly found in coral reefs and rock pools where they can be seen swimming gracefully among the anemones.
Appearance
These fish are well-known for their striking black and white coloration with blue iridescence. Their body shape is laterally compressed, resembling a traditional pair of pajamas, hence their name.
Behavior
While the Pajama Cardinalfish is not a schooling fish, it is generally compatible with other peaceful fish. They are active and enjoy swimming in open areas of the tank. It is best to keep them in a species tank or with species of similar size and temperament.
| Trait | Value |
|---|---|
| Temperament | Peaceful community fish |
| Schooling | No |
| Activity level | moderate |
Water Requirements
| Parameter | Ideal Range | Notes |
|---|---|---|
| Temperature | 22.2–27.8°C (72–82°F) | Use a reliable adjustable heater |
| pH | 8–8.3 | Avoid sudden swings |
| Hardness (GH) | 8-12 dGH dGH | Soft to moderately hard |
| Ammonia | 0 ppm | Any detectable ammonia signals a problem |
| Nitrite | 0 ppm | Toxic even at low levels |
| Nitrate | <20 ppm | Manage through regular partial water changes |
| Min. tank | 60L (16 gal) | Larger tanks are easier to keep stable |
Interesting Facts
- They are nocturnal and more active at night.
- Male Pajama Cardinalfish can develop a bright blue coloration during mating season.
- The Pajama Cardinalfish is known to swim in a V-shape formation when feeling threatened.
📋 Full Care Guide
Ready to set up a tank for your Pajama Cardinalfish? The complete care guide covers tank setup, feeding schedule, common diseases, tank mates, and breeding.
Read Pajama Cardinalfish Care Guide →Related Species
Related Species & Guides
This species profile was reviewed for biological accuracy and practical aquarium care guidance. For suspected illness or disease, test your water parameters first and consult an aquatic veterinarian if symptoms persist.