Hyphessobrycon herbertaxelrodi (Black Neon Tetra)

23 March 2026

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The Black Neon Tetra is a captivating and hardy schooling fish native to the Paraguay basin in Brazil. Known for its striking black and iridescent greenish-white lateral stripes, this peaceful species is highly popular among aquarists for adding dynamic contrast and lively movement to planted community aquariums.

Hyphessobrycon herbertaxelrodi (Black Neon Tetra)

Overview

The Black Neon Tetra (Hyphessobrycon herbertaxelrodi) is an incredibly popular freshwater fish in the aquarium hobby. Despite its common name, it is not in the same genus as the standard Neon Tetra, though it shares a similar torpedo-like body and schooling nature. Its hardiness, stunning contrast, and peaceful demeanor make it an excellent choice for both beginner and experienced aquarists.

Distribution and Habitat

This species is endemic to the Paraguay River basin in southern Brazil. In the wild, they inhabit small tributaries, flooded forests, and slow-moving creeks. These waters are often tinted brown with tannins from decaying organic matter, creating a slightly acidic, soft-water environment shaded by dense canopy cover.

Description of Black Neon Tetra

Image of neon black hyphessobrycon herbertaxelrodi dnz

The Black Neon Tetra is admired for its subtle yet striking beauty, which stands out brilliantly against the dark substrate and green foliage of a planted tank.

Body shape:

They possess an elongated, somewhat laterally compressed, torpedo-shaped body that is typical of many small characins.

Color:

The defining feature is a bold, velvety black horizontal stripe running from behind the gills to the base of the tail. Immediately above this is a brilliant, iridescent greenish-white or silvery stripe. The belly is silvery-white, and the back is a muted brownish-olive.

Barbels:

Like all tetras, this species does not possess any barbels.

Snout:

They have a short, rounded snout with a small, terminal mouth designed for picking small food particles from the water column.

Eyes:

The eyes are relatively large and feature a distinctive, bright red or fiery orange crescent in the upper part of the iris.

Fins:

The fins are mostly transparent with a slight yellowish or whitish tint. They possess a small adipose fin between the dorsal and caudal fins.

The Tail:

The caudal fin (tail) is deeply forked and largely transparent, aiding in their quick, darting swimming motions.

Temper

Black Neon Tetras are exceptionally peaceful and timid. They do not bother other fish and are easily intimidated by larger or more aggressive tank mates.

Sociality

They are highly social, obligate schooling fish. To feel secure and display their best colors and natural behaviors, they must be kept in groups of at least 6 individuals, though larger schools of 10 to 20 or more are highly recommended.

Activity

These tetras are active mid-to-top level swimmers. They will constantly dart around the aquarium, often schooling tightly when feeling threatened and dispersing slightly when relaxed.

Keeping and Caring for Black Neon Tetra

Caring for Black Neon Tetras is relatively straightforward. They are adaptable to a range of conditions, making them a staple for community aquariums.

Tank size:

A minimum tank size of 60 liters (15 gallons) is recommended to provide adequate swimming space for a proper school.

Water Parameters:

While adaptable, they thrive best when kept in conditions that mimic their natural South American habitats.

Temperature

Maintain the water temperature between 23-27°C (73-81°F).

pH

They prefer slightly acidic to neutral water, with a pH range of 5.5 to 7.5.

Hardness

Soft to moderately hard water is ideal, generally between 2 and 15 dGH.

Ammonia, Nitrite, Nitrate

Ammonia and Nitrite must always be at 0 ppm. Nitrates should be kept as low as possible, ideally below 20 ppm, through regular water changes.

Lighting

Dim to moderate lighting brings out their iridescent stripes best. Floating plants can be used to diffuse bright aquarium lights.

Water flow

They prefer gentle to moderate water flow, mimicking the slow-moving streams of their native habitat.

Decorations and Plants

A heavily planted tank with dark substrate provides the best backdrop for their colors. Adding driftwood and dried Indian almond leaves can create a natural blackwater environment while releasing beneficial tannins.

Diet

Black Neon Tetras are omnivorous micro-predators. In captivity, they eagerly accept high-quality crushed flake foods and micro-pellets. To ensure optimal health and coloration, supplement their diet with live or frozen foods such as daphnia, brine shrimp, and bloodworms.

Some Feeding Tips

Feed them small amounts 1 to 2 times a day, offering only what they can consume within a couple of minutes. Because they have small mouths, ensure all food particles are appropriately sized.

Breeding

Breeding is possible in a separate breeding tank. They are egg scatterers and exhibit no parental care. The breeding tank should have very soft, acidic water, dim lighting, and fine-leaved plants like Java Moss or a spawning mop. Once eggs are scattered, adult fish must be removed immediately to prevent them from eating the eggs. The fry hatch in about 24-36 hours and become free-swimming a few days later, requiring infusoria or specialized liquid fry food.

Conclusion

The Black Neon Tetra is a fantastic addition to any peaceful community aquarium. Their resilience, minimal care requirements, and striking visual contrast make them a rewarding species for aquarists of all skill levels. When provided with a proper school and a well-planted environment, they will bring years of active beauty to your tank.

Fish info

Care level: Easy
Temperament: Peaceful
Adult size: 3-4 cm
Life expectancy: 3-5 years
Fish type: Tetra
Temperature : 23-27°C
pH: 5.5-7.5
Color Form: Black, Green, Silver, White

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