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Freshwater fishThreadfin Rainbowfish (School of 5)
Threadfin Rainbowfish (School of 5)
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The females with their smaller oval bodies look quite different from the males with their female-attracting long fins. The interaction of a group of males and females of this species as they pair up and break up will be lively entertainment.
Quick Facts
| Scientific Name | Iriatherina werneri |
| Origin | New Guinea and northern Australia |
| Care Level | Moderate |
| Temperament | Peaceful |
| Adult Size | Up to 2" |
| Lifespan | 2–4 years |
| Diet | Omnivore (tiny foods) |
| Water Temperature | 75–82°F |
| pH | 6.0–7.5 |
| Group Size | Sold as a school of 5 |
| Shipping Size | Approx. ¾–1¼" |
Care Guide
Tank setup: Give them a planted tank with gentle filtration, some floating plants and a lid. They are small, so a sponge over the filter intake keeps them safe.
Feeding: Feed crushed flake or micro pellets once or twice a day, only as much as they eat in a couple of minutes. They also enjoy frozen brine shrimp.
Tankmates: Threadfins are gentle and slow, so keep them with small, peaceful fish. Avoid fin-nippers, which go after their long fin threads.
Good to know: Males grow long, thread-like fins that they spread out to show off to females.
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