
Glowlight tetra
Hemigrammus erythrozonus
One orange-red line on a translucent silver body
A narrow bright stripe stands out against the pale body. Ember tetras have orange spread more widely over the body.
- Adult length
- Up to 4 cm (standard length, without the tail fin)
- Water temperature
- 24–28 °C
- Lifespan
- 2–4 years
- pH
- 5.5–7.5
- Hardness
- 2–15 dGH
- Native range
- Native to the Essequibo River system.
- Natural habitat
- Unknown
Larger predatory tankmates are a risk. Very sparse surroundings may make the colour appear subdued.
Same-species behaviour
Keep at least 6, preferably 10 or more.
Space requirements
Use a 60 × 38 × 30 cm aquarium for a small group.
Diet and feeding
Offer suitably small flakes or granules alongside small live and frozen foods.
Compatibility limits
Choose peaceful companions after checking conditions and predation risk.
Aquarium environment
Dense plants, shade and wood offer visual cover.
Sources
www.fishbase.se ↗ 2026-10-25
www.seriouslyfish.com ↗ 2026-10-21
researcharchive.calacademy.org ↗ 2026-10-22
realaquatics.co.uk ↗ 2026-10-22
blog.aq4aquaristik.de ↗ 2026-10-22
