
True rummy-nose tetra
Petitella rhodostoma
Red stops before the shoulder; both peduncle borders carry black spots
Use the rear-body stripe and lower peduncle spot together to separate similarly named rummy-nose fish.
- Adult length
- Up to 5 cm
- Water temperature
- 24–27 °C
- Lifespan
- 5–6 years
- pH
- 5.5–7
- Hardness
- 2–15 dGH
- Natural habitat
- Native to the lower Amazon and Orinoco river basins.
Monitor fading, disturbance and feeding.
Appearance and identification
Head red stays before the shoulder. A dark rear stripe extends towards the anal fin, whose anterior base is marked. Trade labels are unreliable.
Same-species behaviour
Keep at least ten.
Space requirements
A 90 cm swimming length for ten or more.
Diet and feeding
Offer suitably small dry and frozen or live foods; check individual feeding.
Compatibility limits
Avoid dominating companions.
Aquarium environment
Keep an open swimming lane. Plants are generally undisturbed.
Sources
www.fishbase.se ↗ 2026-10-25
www.seriouslyfish.com ↗ 2026-10-23
www.aquariumglaser.de ↗ 2026-10-23
www.scielo.br ↗ 2026-10-23

