Threadfin rainbowfish
Iriatherina werneri
FishFreshwater
- Care level
- Moderate
- Temperament
- Peaceful
- Recommended tank
- 60 L
- Maximum size
- 5 cm
- Temperature
- 24–29 °C
- pH
- 6–7.5
- Group size
- ≥ 6
- Diet
- Omnivore
Care at a glance
The threadfin rainbowfish from New Guinea and northern Australia is small and translucent, but the males carry elegant, thread-like extensions on the dorsal, pelvic and anal fins. When displaying they spread them like fans, which makes for one of the finest spectacles in a nano tank.
It has a small mouth and therefore needs very fine food, and it cannot cope with fin nippers: those threads are an easy target. Keep it in a calm group in clear, warm water with planting and little flow.
Best not combined with
Related species
Keep Threadfin rainbowfish in the BlubHub app
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Values are mainstream hobbyist guidance, not gospel — always watch what your own animals need.