Glowlight Tetra (Hemigrammus Erythrozonus) Fish Species Profile

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The Glowlight Tetra is a small and slender, attractive, peaceful, shoaling fish and its friendly and active disposition as well as its ease of care makes it an ideal, and famous fish for the community aquarium. It should be kept with similar-sized, non-aggressive species.

This Tetra is silver in colour and has a bright iridescent orangey-red stripe that continues from the snout to the base of its tail, the front of the dorsal fin is the same colour as the stripe. The anal and pelvic fins are transparent and edged in white.

Scientific NameHemigrammus Erythrozonus
Other NamesGlowlights, Fire Neon Tetra
OriginsSouth America
Aquarium LevelMiddle
DifficultyBeginner - Intermediate
Best kept asGroups 6+
Lifespan2 - 4 years
Maximum Sizeup to 5 cm
Water Conditions
Water TypeFreshwater
Temperature74 - 82 ℉ (23.3 - 27.8 ℃)
PH5.5 - 7.5
GH3 - 15

Origins of the Glowlight Tetra

The Glowlight Tetra originates in the Essequibo basin in Guyana. They have been found in the Potaro, Rio Essequibo, and Mazaruni Rivers in South America.

They inhabit forested areas, in small tributaries off the main river channel where the water is usually stained a dark brown colour with tannins from decaying Organic matter and is often soft and highly acidic because of this.


The Glowlight Tetra will eat a variety of foods. It's essential to feed them small-sized food and to vary their diet.

They readily accept good quality crushed flakes, micro pellets and freeze-dried food. They also enjoy live and frozen fare such as brine shrimp and mosquito larvae. These Tetras will not eat any food that falls to the bottom of the tank so try not to overfeed them.

Sexing the Glowlight Tetra

It is easy to determine the male from the female Glowlight Tetra. Females have more rounded stomachs and larger bodies than males. In contrast, the males are generally smaller and more slender, particularly in the abdomen.

Breeding the Glowlight Tetra

Glowlight Tetras have successfully been bred in the home aquarium, but the process is understood to be somewhat challenging.

A separate breeding tank will be required with very soft warm water and dim lighting, the tank should be heavily planted with fine-leaved plants such as java moss or a spawning mop is also suitable.

It would be better for you to condition your fish with high-quality flake food or live food three to five times per day.

You will know when a female is ready to spawn as she becomes very plump. At this point, you should place your best-coloured male and the female in the breeding tank. When the couple is ready to spawn, the male will dart about the tank after the female, presently performing a courting display in which he flicks his fins and shimmies near the female. When courting finishes, both fish roll on their backs, the female discharges her eggs, and the male fertilizes them.

A regular spawning will produce around 100 to 150 eggs. The parents will not provide any parental care and will consume the eggs if they are given the opportunity, so remove them as soon as spawning is finished.

The eggs are susceptible to light, so keep the breeding tank dark. Hatching usually occurs one day later, and the fry becomes free-swimming a couple of days later.

The fry should first be fed infusoria or paramecium cultures, and then on finely crushed flake food. After several days, you can provide them with freshly hatched brine shrimp and micro worms to help them grow.

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Date Added: 9/15/2020 - Updated: 9/16/2020 12:36:43 AM