Glowlight Tetra Care Guide - Tank Setup, Diet & Breeding

The Glowlight Tetra is a small, elegant characin with a translucent silver to peach-coloured body and a vivid red-orange stripe running from the eye toward the base of the tail. This luminous marking gives the species its familiar name and stands out particularly well against a darker background. The fins are mostly transparent, with subtle colour in the dorsal and anal fins.

Peaceful and active, Glowlight Tetras spend much of their time moving through the middle levels of the aquarium in a coordinated group. They are not as tightly schooling as some other small tetras, but they become more confident and display more natural behaviour when kept alongside several companions.

In the wild, they are associated with shaded streams and small tributaries flowing through forested areas. Leaf litter, submerged roots and overhanging vegetation create a dim, complex habitat where the fish can forage among cover while their bright lateral stripe helps the group remain visually connected.

Hemigrammus erythrozonus was first described in the early twentieth century and has become one of the most popular small community fish in the hobby. Its modest size, peaceful temperament and striking colouration make it well suited to planted and blackwater-style aquariums.

Glowlight Tetras are native to the Essequibo River basin in Guyana, South America. They inhabit slow-moving forest streams, tributaries and tannin-stained blackwater environments with dense marginal vegetation.

A group of Glowlight Tetras should have at least a 60-litre aquarium, ideally measuring around 60 x 30 x 30 cm or larger. Use a dark, fine-grained substrate with dense planting around the sides and rear, leaving open swimming space through the centre. Driftwood, roots, leaf litter and floating plants help recreate their shaded forest-stream habitat. Gentle filtration, subdued lighting and some water movement are appropriate, while a secure lid is useful because these active tetras can jump.

Up to 4 cm (1.6 in) in adult length. Females are generally slightly larger and deeper-bodied than males.

Glowlight Tetras are omnivores and should receive a varied diet of high-quality small flakes, micro-pellets and suitably sized granules. Supplement this with foods such as baby brine shrimp, daphnia, cyclops and finely chopped bloodworm. Small portions offered regularly help ensure that every fish gets enough food, as their tiny mouths are not suited to large pieces.

Glowlight Tetras are peaceful community fish that can be kept with similarly sized tetras, rasboras, small peaceful barbs, livebearers, dwarf Corydoras and other gentle bottom-dwellers. Suitable tankmates include neon tetras, harlequin rasboras, ember tetras, honey gouramis and small peaceful snails or shrimp, although very small shrimp fry may be eaten. Avoid large cichlids, predatory fish, boisterous species and persistent fin-nippers, which may stress or injure them.

Glowlight Tetras are egg-scattering fish that breed most readily in a separate, dimly lit breeding tank with soft, slightly acidic water and fine-leaved plants or spawning mops. Condition a group with plenty of live or frozen foods, then introduce the adults when females are full of eggs. They scatter their eggs among the plants, after which the adults should be removed because they may eat them. The eggs usually hatch within about 24 hours, and the tiny fry need infusoria or another suitably fine first food before they can take newly hatched brine shrimp.

Females are usually fuller through the abdomen, particularly when carrying eggs, while males tend to be slimmer and more streamlined. The colour pattern is similar in both sexes, so body shape is the most reliable visible distinction.