Betta Trading

Glowlight Tetra

The Glowlight Tetra,  Hemigrammus erythrozonus is a peaceful little fish.  The other common names of the Glowlight Tetra are variations on the spelling of Glowlight Tetra; Glo-light tetra and Glolight.  The Glowlight Tetra usually grows to about one inch (2.5cm) long but there are reports of ones as big as one and a half times this size. This is a South American tetra coming from the Essequibo River in Guyana.  This river has rapids and water falls.

Water Conditions

The Glowlight Tetra is a tropical fish. 24̊ C (75̊ F) is a suitable temperature for a mixed tank with them in although in their natural habitat they have slightly warmer water than this.  The ideal pH for them is about 6.8 although they will tolerate a range of ph from 6 to 8.  In a mixed tank 7 (neutral) is suitable.

The hardness of the Essequibo River is low; soft water is better for GlowlightTetras.  They will tolerate slightly harder water; they are quite tough little fish.      


The Glowlight Tetra is a schooling fish and I suggest at least four and preferably more be kept together.  Other fish that can be kept with them include all the other tetras, most of the barbs, the Danios, most common live bearers, the Corydoras catfish, Clown Loaches, Kuhli Loaches and other small peaceful fish.

Common companions include Black neon tetras, Black Widow Tetras, Cardinal Tetras, Emperor Tetras, Neon Tetras, Peppered Catfish, Siamese Fighting Fish,  White Cloud Mountain Minnows and all sorts of Danios.  Not all these common companions are compatible with each other.

Fish I would not suggest as companions for Glowlight Tetras are the larger and more aggressive fish and the ones that need different conditions.  These include many of the Cichlids as well as such fish as the Great White Shark.


The Glowlight Tetra is an omnivore and will eat all normal fish foods.  I suggest a good quality flake food as a basis of their diet and live and frozen food to add variety.  Good live foods include Daphnia and mosquito larvae (wrigglers).  Good frozen foods include frozen bloodworms.


Like most of the tetras the Glowlight Tetra scatters its eggs and does not look after its babies.  Removing the adults after spawning is a good idea. This fish is moderately hard to breed.  To improve your chances of success, feed the adults well on rich foods including plenty of live food.  The water needs to be very soft and slightly acidic.  Raising the temperature to about 27̊ C (81̊ F) may induce spawning.

The babies are small and difficult to raise in the early stages.  They benefit from live food of appropriate size at all ages.