Glowlight Tetra

• ExerciseModerate

  An active swimmer that appreciates open swimming space.

• GroomingEasy tank upkeep

  No grooming here — steady water quality and routine tank care do it.

• Living spaceNano-tank friendly

  Happy in a small, stable, well-filtered tank.

• Owner experienceSome experience helps

  A little know-how makes life smoother.

• Commitment4–5 years

  Plan for a long, loving relationship.

Health to watch: Ich (white spot) · Fin rot · Skin conditions

The glowlight tetra (Hemigrammus erythrozonus) is a small characin from the Essequibo River basin of Guyana in northern South America, where it lives in soft, tannin-stained blackwater. It reaches about 4 cm and lives 4–5 years. A single glowing orange-red line runs across its otherwise translucent silver body. Glowlights are peaceful shoalers for a tank of 60 litres or more, kept in groups of six or more. Recreate their soft, acidic home at 22–28°C with a pH of 6.0–7.0, dark substrate, driftwood and dense planting. Subdued lighting and a shaded aquascape make their orange line glow most vividly. As micro-omnivores they eat fine flake, micro-pellets and small frozen foods such as daphnia and brine shrimp. Gentle and undemanding, they are excellent companions for other small, calm community fish and shrimp. Their main risks are ich and fin rot in poor or unstable water, easily prevented with a mature, well-planted tank and regular water changes.

• How active is a Glowlight Tetra?

  Moderate. An active swimmer that appreciates open swimming space.

• How much maintenance does a Glowlight Tetra need?

  Easy tank upkeep. No grooming here — steady water quality and routine tank care do it.

• What tank size does a Glowlight Tetra need?

  Nano-tank friendly. Happy in a small, stable, well-filtered tank.

• Is a Glowlight Tetra a good fit for first-time owners?

  Some experience helps. A little know-how makes life smoother.

• How long do Glowlight Tetra live?

  4–5 years. Plan for a long, loving relationship.

• What health issues affect the Glowlight Tetra?

  Keep an eye out for Ich (white spot), Fin rot, Skin conditions. These are worth raising with your vet, along with any screening they recommend.

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