Black Neon Tetra Care Guide: Tank Size, Diet & Tankmates
The black neon tetra (Hyphessobrycon herbertaxelrodi) is a quietly striking little fish that deserves more attention than it gets. A bold black stripe runs the length of the body, edged on top by a glowing iridescent gold-green line that catches the light beautifully—especially in a planted tank over dark substrate. They are hardy, peaceful, and adaptable, which makes them one of the best schooling fish for a community aquarium. We regularly keep black neon tetras in stock here at Tropical Treasures, along with plenty of other schooling tetras. Stock rotates, so if you do not see them listed just message us and we will let you know what is swimming.
Meet the Black Neon Tetra
Black neon tetras come from the Paraguay basin in South America, where they live in soft, slightly acidic blackwater streams. They grow to roughly 1.5–1.75 inches and can live 5 years or more with good care. Despite the similar name, they are not closely related to the common neon tetra—the black neon is hardier and a little larger, with that distinctive dark-and-gold stripe rather than the red-and-blue of a true neon. They belong to the same friendly group of characins as the cardinal tetra, ember tetra, and lemon tetra.
Tank Size and Setup
A school of black neon tetras is happy in a tank of 20 gallons or larger. They swim mainly in the middle of the water column and love open space framed by live plants. A darker substrate, some driftwood, and gentle filtration really make their gold stripe glow. If you are setting up a first community tank, black neons make an excellent, forgiving anchor species and fit right in with our beginner-friendly fish.
Water Parameters and Temperature
Black neon tetras are wonderfully adaptable but show their best color in soft to moderately hard water. Aim for a temperature of 73–81°F, a pH of 5.5–7.5, and stable, well-filtered conditions. Like most tetras they dislike sudden swings, so a reliable heater and a routine of small weekly water changes go a long way. Acclimate new arrivals slowly.
Feeding Your Black Neon Tetra
These are easy, enthusiastic eaters. A quality flake or a small nano pellet makes a great staple, and you can round out the diet with frozen or live foods like daphnia, brine shrimp, and bloodworms. Variety brings out the best color and condition. Browse our full range of freshwater fish food to keep your school thriving.
Tankmates and Temperament
Black neon tetras are genuinely peaceful and should always be kept in a group of at least 6–8, ideally more, so they feel secure and show off natural schooling behavior. They mix beautifully with other calm community fish. Great companions include harlequin rasboras, rummynose tetras, and peaceful bottom dwellers like pygmy corydoras. They are also peaceful enough to coexist with adult cherry shrimp in a well-planted tank. For more community-building ideas, browse our community fish and nano fish collections.
Is the Black Neon Tetra Right for You?
If you want a hardy, peaceful, understated-but-beautiful schooling fish that rewards a planted tank without demanding expert care, the black neon tetra is hard to beat. It is forgiving for newer hobbyists yet refined enough to add depth and contrast to a seasoned aquascaper's community. If you enjoy black neons, you may also like our other tetra care reads, such as cardinal tetra vs neon tetra, the black phantom tetra care guide, and Columbian tetra tankmates.
Frequently Asked Questions
How many black neon tetras should I keep together? Keep at least 6–8, though a group of 10 or more looks far more natural and helps them feel secure. The bigger the school, the bolder and more colorful they tend to be.
What is the difference between a black neon tetra and a regular neon tetra? They are different species. The black neon has a black-and-gold horizontal stripe and is hardier and slightly larger, while the true neon tetra shows the familiar red-and-electric-blue stripes.
Are black neon tetras good for beginners? Yes. They are among the hardiest and most adaptable tetras, very peaceful, and easy to feed, which makes them an excellent choice for newer aquarists as long as they are kept in a group with stable water.