Overview
The Threadfin Rainbowfish is a popular choice for freshwater aquariums due to its vibrant colors and peaceful nature. It requires a well-maintained tank with plenty of swimming space and a moderate water flow. These fish are not known to be aggressive and can be kept in community tanks with other peaceful species. Regular water changes and a balanced diet are essential for their health.
Scientific Classification
| Rank | Classification |
|---|---|
| Family | Melanotaeniidae |
| Genus | Iriatherina |
| Species | Iriatherina werneri |
| Water type | freshwater |
Natural Habitat
Native to the streams and rivers of New Guinea, Threadfin Rainbowfish thrive in slow-moving waters with dense vegetation.
Appearance
Threadfins are known for their iridescent blue, red, and yellow coloration, with a distinctive thread-like fin that extends from their tail.
Behavior
These fish are generally calm and do not exhibit high levels of aggression. They are not known to school and are best kept in groups of 3-5 individuals.
| Trait | Value |
|---|---|
| Temperament | peaceful community fish |
| Schooling | No |
| Activity level | moderate |
Water Requirements
| Parameter | Ideal Range | Notes |
|---|---|---|
| Temperature | 22–28°C (72–82°F) | Use a reliable adjustable heater |
| pH | 6.5–7.5 | Avoid sudden swings |
| Hardness (GH) | 5-15 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 | 40L (11 gal) | Larger tanks are easier to keep stable |
Interesting Facts
- Threadfins are known for their unique thread-like caudal fin.
- They are one of the few fish species that can change color based on their mood.
- Threadfins are often used in scientific research due to their genetic similarity to humans.
📋 Full Care Guide
Ready to set up a tank for your Threadfin Rainbowfish? The complete care guide covers tank setup, feeding schedule, common diseases, tank mates, and breeding.
Read Threadfin Rainbowfish 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.