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Maximum size : 5 cm

Glowlight Tetra - Hemigrammus erythrozonus : Complete Fish Profile & Care Guide

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The Glowlight Tetra (Hemigrammus erythrozonus) is a stunning and graceful addition to any community aquarium. These shoaling fish are known for their active and amiable nature, and their straightforward upkeep makes them an ideal species for novice fish keepers. To ensure their happiness, it's essential to keep Glowlight Tetras in groups of at least six with similarly sized, peaceful tankmates. These small schooling fish prefer heavily planted tanks that offer plenty of hiding places, especially along the back and sides, while still providing an open area for swimming. You can find them mostly schooling in the midwater region. The Glowlight Tetra is identifiable by its bright iridescent orange-red stripe that runs from the snout to the base of its tail. Its silver body is highlighted by this striking stripe, which is matched in colour by the front of the dorsal fin. The anal and pelvic fins are transparent, with a delicate white edge. Overall, the Glowlight Tetra is a delightful addition to any community aquarium. Their active and peaceful nature, paired with their striking appearance, make them a favourite amongst hobbyists.

Glowlight Tetra Photos

Sexual Dimorphism

In distinguishing between male and female Glowlight Tetras, one can observe that females have larger bodies and more rounded stomachs than their male counterparts. In contrast, males are generally more slender and smaller in size, particularly in the abdominal region.
Featured Male
Featured Female
Male Female

Quick Facts

Scientific NameHemigrammus erythrozonus
Year Described1909
Other NamesGlowlights, Fire Neon Tetra
Max Size5 cm
Aquarium LevelMiddle
DifficultyBeginner - Intermediate
Best kept asGroups 6+
Lifespan2 - 4 years

Water Parameters

Water TypeFreshwater
PH5.5 - 7.5
GH3 - 15
74 - 82
23 - 28

Natural habitat

The Glowlight Tetra originates in the Essequibo Basin in Guyana, South America. They've been discovered in the Potaro, Rio Essequibo, and Mazaruni Rivers, adding to their global appeal. In their natural habitat, the Glowlight Tetra inhabits forested areas in small tributaries off the main river channel. The water in these serene streams is usually stained a dark brown colour with tannins from decaying organic matter and is often soft and highly acidic, providing the perfect environment for these remarkable fish to thrive. As you observe the Glowlight Tetra in its natural habitat, you'll gain a deeper appreciation for the delicate balance of our planet's ecosystems. These fish serve as a reminder of the importance of conservation efforts to protect and preserve our planet's precious resources. Prepare to be mesmerized by the stunning beauty of the Glowlight Tetra and the wonders of the natural world. With their distinctive markings and vibrant colours, these fish are a true marvel of nature and a captivating addition to any aquarist's collection.

How to breed the Glowlight Tetra

Breeding Glowlight Tetras in a home aquarium can be challenging, but it's possible with the right conditions. To begin, set up a separate breeding tank with soft, warm water, and dim lighting. A heavily planted tank with fine-leaved plants such as java moss is preferable. Conditioning the fish with high-quality flake or live food three to five times a day is recommended. When a female is ready to spawn, she becomes plump, and it's time to introduce the couple to the breeding tank. The male will court the female by flicking his fins and shimmies around her. After the courting process, both fish will roll on their backs, and the female will discharge her eggs, which the male will fertilize. In general, the couple will produce around 100 to 150 eggs, and parents won't provide any parental care, and they may consume eggs if given the chance. Therefore, remove them as soon as spawning is over. Keep the breeding tank dark, as the eggs are sensitive to light. One day later, the eggs will hatch, and a couple of days later, the fry will become free-swimming. The fry should be fed infusoria or paramecium cultures initially and finely crushed flake food. Then, after several days, provide them with freshly hatched brine shrimp and micro worms to encourage growth.

Diet & feeding

The diet of the Glowlight Tetra should be carefully considered, as these fish require a diverse range of foods in small portions. High-quality crushed flakes and micro pellets are readily accepted and should form the basis of their diet. However, it's important to provide a varied diet to ensure they receive all the necessary nutrients. In addition to flakes and pellets, Glowlight Tetras enjoy live and frozen food, such as brine shrimp and mosquito larvae. It's worth noting that these Tetras are surface feeders and will not eat any food that falls to the bottom of the tank. Overfeeding can lead to digestive problems and reduced water quality, so it's essential to monitor their feeding habits and adjust their diet accordingly.

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