Hemigrammus erythrozonus, commonly known as the glowlight tetra, is a small tropical fish from the Essequibo River, Guyana, South America.

It is larger than the neon tetra, and its peaceful disposition makes it an ideal, and popular, community tank fish.

Java moss (Taxiphyllum barbieri) or Fontinalis are suggested but not mandatory, or a spawning mop made of woolen thread.

When the female is well rounded transfer the pair to the breeding tank in the late afternoon hours.

Spawning behavior: The male will swim around in a quick manner locking his fins when near the female.

During the spawning act both fish roll over, when the female is in the upside down position she ejects the eggs while the male fertilises them.

Some believe light contributes greatly to the eggs succumbing to fungal infections, though this may have more to do with cleanliness of tank and water conditions.

Fry can be fed with infusoria, paramecium culture, crushed flakes, and rotifers after they have used all the yolk sack.

On the fourth day a very small portion of newly hatched brine shrimp should be introduced.

The young consume relatively large live foods such as nauplii of brine shrimp.

Care of the breeding tank: Bottom sediment should always be removed and regular water changes done during the rearing period in order to avoid an accumulation of ammonium and nitrates which can be toxic to the fry.

At three weeks of age, the fry will start showing their characteristic orange line and will be a size of about 1 cm (1⁄2 in).