Glowlight tetra

Aquarium fish: Glowlight tetra (Hemigrammus erythrozonus)
Size: 4 cm
Origin: South America
Water temperature: 24-28 ° C
Aquarium volume: 54 l

Glowlight tetra (Hemigrammus erythrozonus) – a small freshwater fish from the tetras family, often found in aquariums.


South America . Inhabits the longest river of Guyana – Rio Essequibo. Most often found in its tributaries in forest areas. In very acidic and brown-colored waters.

Characteristics and disposition

One of the most common fish found in aquarium stores . Due to the low price and high durability, they will be the right choice for beginner aquarists. Adult fish reach up to 4 cm in length. Females are thicker and usually larger than males. They are characterized by the gray-green color of the torso, through which a shiny orange stripe runs.

Transparent or white fins. The albino variety was also specially bred for commercial purposes . A shoal species by nature. It is recommended to keep at least 6 individuals , preferably 10 or more. In a large group, the fish not only feel better, but also present themselves more effectively in the aquarium.

They mostly stay in the middle of the aquarium.

Nutrition and feeding

They are happy to eat any available food. Good condition and coloring will be ensured by regular administration of live and frozen foods, e.g. bloodworm, daphnia, artemia.


A small flock can be kept in a 54-liter aquarium.

They look best against the background of lush vegetation. In modestly arranged tanks, their colors will seem faded. Although they can live in alkaline water, they feel best in acidic water in the range of approx. 5.5 – 6.5 pH. If we want to reflect their natural environment , we will need river sand, a branch with twisted roots and a handful of dried leaves (e.g.

beech, oak). Wood and leaves will tint the water the color of weak tea. We replace rotting leaves every few weeks. Lighting should not be too strong. In an aquarium prepared in such a way, the fish look the most interesting.

Turists are colorful and peaceful fish. They will be the right choice for a social aquarium where they can be kept with most of the live fish, zebrafish , razor, other tetras and calm bottom fish such as cuirass or small armored fish. Gurami and nurses will also be great companions for them . They should not be combined with much larger fish, such as scalar , which can treat them as food. In a biotope aquarium they can be together with other turtles and rapids, microorganisms, cichlids and benthic fish from South America.


Tortoises are fish that are relatively easy to breed. However, a separate, 40-liter aquarium will be necessary to raise more fry. Live small-leaved plants or an artificial aquarium mop should be placed in it. Optionally, you can cover the bottom with a fine mesh through which the spread roe will pass. The water should be soft and acidic in the range of 5.5 – 6.5 pH, 1-5 gH and temperature 27-29 ° C.

To obtain similar parameters, it will be helpful to filter the water through peat or to use demineralized water from the RO filter. A small sponge filter is sufficient for biological filtration and aeration. Fish can be bred in larger groups or in pairs. The second method is more effective, where the females are separated from the males and we feed them plentifully (3 times a day for about a week) with live or frozen food. When the females are clearly thicker, choose the thickest one and the best colored male and transfer them to the breeding aquarium in the evening.

Spawning usually takes place in the morning of the next day. The male quickly swims after the female and tries to chase her to a previously chosen place. If the female agrees, the fish approach each other and rotate around their axis, releasing 10 – 15 eggs during this time. In total, about 100 to 150 eggs are laid. Adult fish eat their eggs and fry so they must be separated as soon as possible.

Hatching occurs within 24-26 hours. The larvae begin to swim freely after another 3-4 days. During the first days, micro-foods should be given until they are large enough to take micro nematodes, artemi larvae, daphnia, etc. In the first period, eggs and young are very sensitive to light, so it is best to cover the aquarium.


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