Erythrosonus fish - flaming tetra

Erythrosonus hemigramus or tetra-firefly (lat. Hemigrammus erythrozonus gracilis) is a small aquarium fish from the genus tetra, which is distinguished by a beautiful luminous strip along the body.

A flock of these fish can amaze even the most experienced and avid aquarist. With age, the color of the body of erythrosonus becomes more pronounced and it becomes beautiful.

This haracin one of the most peaceful aquarium fish. Like other tetras, erythrosonus feels good only in a pack, from 6-7 individuals and above.

They look very good in a common aquarium, with small and peaceful fish.

Living in nature

The erythrosonus fish was first described by Dubrin in 1909. It lives in South America, in the Essexibo River. Essexibo is the largest river in Gayana and throughout its length there are many different biotopes.

Most often, erythrosonuses are found in densely overgrown with jungle tributaries of the river. The water in such shallow rivers is usually dark brown in color from rotting leaves and very acidic.

They live in schools and feed on insects and their larvae.

At this moment, it is impossible to find fish caught in nature on sale. All erythrosonuses are already local breeding.


Erythrosone is one of the small and slender tetras. It grows up to 4 cm in length, and lives in the aquarium for about 3-4 years.

In some ways, it is similar to black neon, especially its luminous strip, but this is definitely a different kind of fish. It is not difficult to distinguish between them; black neon has a black body, respectively, and erythrosonus is translucent.

Difficulty in content

If the aquarium is well balanced and properly launched, but the erythrosonus fish will easily contain even a beginner.

They live in dozens of different conditions and reproduce very simply. They are well suited for those who want to try the first time to breed fish.

The particular complexity in the content of erythrosonus does not differ, but feeds on all types of feed. It is better to feed them several times a day, with a small amount of food, since the fish are not very voracious.


Since they are omnivorous, they are happy to eat all kinds of live, frozen or artificial feed in the aquarium. In the aquarium, feeding them is not difficult, almost all types of food are good.

Flakes, granules, live and frozen food, the main thing is that the fish can swallow them. It is better to feed 2-3 times a day, in small portions, since the fish almost does not eat food that has fallen to the bottom.

Flakes, granules, live and frozen food, the main thing is that the fish can swallow them. It is better to feed 2-3 times a day, in small portions, since the fish almost does not eat food that has fallen to the bottom.

Aquarium Maintenance

It is better to keep erythrosonuses in a pack, from 6-7 fish, so they need an aquarium of 60 liters or more. They are very undemanding to the conditions of detention, the main thing is that the conditions are reasonable and without extremes.

Erythrosonuses feel best in soft and acidic water, but fish sold in your area have already adapted to life in other conditions.

Light for the content of any tetra should be diffused and dim, erythrosone is no exception. The easiest way to achieve this is by putting floating plants on the surface of the aquarium.

The most important parameter is the purity of the water and the low content of ammonia and nitrates. To do this, weekly change part of the water and use a filter in the aquarium.

Water parameters for the content: temperature 23-28С, ph: 5.8-7.5, 2-15 dGH.

It’s best to create a natural biotope in the aquarium. The soil at the bottom is dark river sand, as adornments are driftwood and small stones. You can also put leaves on the bottom that give the water a brownish tint.

There are not many plants in the rivers where the erythrosonus lives, so it does not need lush thickets.

Gender differences

Erythrosonus females are larger, fuller than males, which in turn are more elegant and more brightly colored.

Male (above) and female erythrosonus


Spammers are quite easy to get divorced, but for beginners it will be a rewarding experience.

For breeding, prepare a separate aquarium with very soft water of not more than 6 dGH and a pH of 5.5 to 7.0.

It is recommended to use peat to obtain such parameters.

The temperature of the water is increased to 25-28 C.

Spawning should be very poorly lit, with a maximum of natural light. From plants use Javanese moss or other plants with small leaves.

Producers are fed live feed up to five times a day. Desirable variety, bloodworm, brine shrimp, tubule, etc.

When the couple is ready to spawn, the male begins to chase the female, nibbling her fins and trembling in front of her with her whole body.

After some time, courtship goes into spawning, when the fish turn on their backs and release caviar and milk. Typically, the number of eggs ranges from 100 to 150.

Parents do not care for caviar and can even eat it, so they need to be jailed right away. Some aquarists use a protective net, which is laid to the bottom.

Caviar is extremely sensitive to light, and it is recommended to shade the aquarium. About a day later, the larva will hatch, and the male will swim in another three days.

After two weeks, the male is first painted in silver, and after another three weeks, a strip appears in it. At first, it should be fed with infusoria and nematodes, and after a while transferred to nauplii artemia.

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