Threadfin rainbowfish
Iriatherina werneri
Photo: NRJMelvinT · CC BY-SA 4.0
- Tank length
- 60 cm24 in
- Group
- 6+
- Temperature
- 23–28 °C73–82 °F
- pH
- 5.2–7.5
- Adult size
- 4 cm2 in
- Lifespan
- 3–6 yrs
Avoid fin nippers and provide fine foods.Avoid fin nippers and provide fine foods.
Tank sizes
Good tankmates
Avoid with
- Acei cichlid
No shared pH rangeNo shared pH range
- American flagfish
American flagfish may nip Threadfin rainbowfishAmerican flagfish may nip Threadfin rainbowfish
- Blind cave tetra
Blind cave tetra may nip Threadfin rainbowfishBlind cave tetra may nip Threadfin rainbowfish
- Brevis shell dweller
No shared pH rangeNo shared pH range
- Buenos Aires tetra
Buenos Aires tetra may nip Threadfin rainbowfishBuenos Aires tetra may nip Threadfin rainbowfish
- Butterfly splitfin
Butterfly splitfin may nip Threadfin rainbowfishButterfly splitfin may nip Threadfin rainbowfish
- Caudopunctatus
No shared pH rangeNo shared pH range
- Chinese barb
Chinese barb may nip Threadfin rainbowfishChinese barb may nip Threadfin rainbowfish
- Colombian tetra
Colombian tetra may nip Threadfin rainbowfishColombian tetra may nip Threadfin rainbowfish
- Multies
No shared pH rangeNo shared pH range
- Pindani
No shared pH rangeNo shared pH range
- Red eye tetra
Red eye tetra may nip Threadfin rainbowfishRed eye tetra may nip Threadfin rainbowfish
Data used by the planner
| Temperature | 23–28 | AqAdvisor (aqadvisor.com), retrieved 2026-10-04 · low confidence |
|---|---|---|
| pH | 5.2–7.5 | AqAdvisor (aqadvisor.com), retrieved 2026-10-04 · low confidence |
| Hardness (dGH) | 5–12 | AqAdvisor (aqadvisor.com), retrieved 2026-10-04; agrees with FishBase (fishbase.se), retrieved 2026-10-04 · medium confidence |
| Origin | Northern Australia and New Guinea | curated-v0 (needs expert review) · medium confidence |
| Beginner friendly | Yes | curated-v0 (needs expert review) · medium confidence |
| Care level | easy | curated-v0 (needs expert review) · medium confidence |
| Activity | moderate | curated-v0 (needs expert review) · medium confidence |
| Swimming level | middle | curated-v0 (needs expert review) · medium confidence |
| Temperament | peaceful | curated-v0 (needs expert review) · medium confidence |
| Nips fins | No | curated-v0 (needs expert review) · medium confidence |
| Long fins | Yes | curated-v0 (needs expert review) · medium confidence |
| Territorial | No | curated-v0 (needs expert review) · medium confidence |
| Lives in groups | Yes | curated-v0 (needs expert review) · medium confidence |
| Minimum group | 6 | curated-v0 (needs expert review) · medium confidence |
| Diet | omnivore | curated-v0 (needs expert review) · medium confidence |
| Lifespan (years) | 3–6 | curated-v0 (needs expert review) · low confidence |
| Months to adult size | 12 | curated-v0 (needs expert review) · low confidence |
| Safe with plants | Yes | curated-v0 (needs expert review) · medium confidence |
| Minimum tank length | 60 | curated-v0 (needs expert review) · medium confidence |