Black Neon Tetra: A Comprehensive Care Guide (Hyphessobrycon herbertaxelrodi)
The Black Neon Tetra (Hyphessobrycon herbertaxelrodi) is a hardy and attractive freshwater fish known for its sleek black stripe and shimmering silver-white line that runs along its body. Despite the name, this species is not closely related to the Neon Tetra, but it shares a similar streamlined shape and schooling behavior.
Black Neon Tetras are popular among aquarists because they are peaceful, durable, and easy to care for, making them an excellent choice for beginner and experienced fish keepers alike. When kept in large schools, their contrasting black and metallic stripes create a beautiful visual effect as they move together through the aquarium.
Natural Habitat and Distribution
Black Neon Tetras originate from South America, where they are found in the Paraguay and southern Brazil river systems.
In the wild they inhabit:
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Slow-moving streams
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Small rivers
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Floodplain waterways
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Areas with submerged vegetation
These environments often contain soft, slightly acidic water and natural plant cover.
Size
Adult size: approximately 1.5 inches (3.5–4 cm)
Black Neon Tetras remain small and slender throughout their lives, making them ideal for community aquariums.
Tank Size
Minimum tank size: 20 gallons
Recommended tank size: 30 gallons or larger
Because they are schooling fish, Black Neon Tetras should be kept in groups of at least 6–8 fish, though larger schools create a more natural display and help reduce stress.
A longer aquarium provides more swimming space for these active fish.
Water Parameters
Black Neon Tetras are very adaptable and tolerate a range of aquarium conditions.
Temperature: 72–80°F
pH: 5.5–7.5
Hardness: soft to moderately hard
Like most community fish, they thrive best in clean, stable water with regular water changes.
Aquarium Setup
Black Neon Tetras do well in a variety of aquarium setups but look especially impressive in planted tanks.
Recommended tank features include:
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Live plants along the sides and back of the aquarium
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Driftwood or natural decorations
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Darker substrate to highlight their coloration
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Open swimming space in the center
Providing both plant cover and open swimming areas helps them feel secure while allowing them to school naturally.
Diet
Black Neon Tetras are omnivorous and easy to feed.
In the aquarium they will accept:
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High-quality flakes
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Small pellets
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Frozen foods such as brine shrimp or bloodworms
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Small live foods
Providing a varied diet helps keep them healthy and encourages strong coloration.
Behavior and Temperament
Black Neon Tetras are peaceful schooling fish that spend most of their time swimming in the middle levels of the aquarium.
Typical behaviors include:
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Loose schooling with other members of their group
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Gentle interaction with tank mates
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Active swimming through open areas of the aquarium
They are generally calm fish and rarely show aggression.
Tank Mates
Black Neon Tetras make excellent community fish and can be kept with a wide variety of peaceful species.
Good tank mates include:
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Corydoras
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Rasboras
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Other small tetras
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Dwarf cichlids
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Small rainbowfish
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Gouramis
Avoid aggressive fish or species large enough to view them as food.
Breeding
Black Neon Tetras are egg-scattering fish that can be bred in aquariums with the right conditions.
During spawning:
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Eggs are scattered among plants or spawning mops
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Adults do not guard the eggs
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Eggs usually hatch within 24–36 hours
The fry are extremely small and should initially be fed infusoria or powdered fry foods before transitioning to baby brine shrimp.
Fun Facts
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Despite their name, Black Neon Tetras are not closely related to Neon Tetras, though they share a similar appearance.
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Their scientific name herbertaxelrodi honors the well-known tropical fish expert Herbert R. Axelrod.
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When kept in large groups, their bright reflective stripe can create a striking flash effect as the school turns in unison.
Conclusion
The Black Neon Tetra is a hardy and beautiful schooling fish that works well in planted aquariums and peaceful community tanks. Their contrasting black and silver stripes, calm temperament, and adaptability make them a favorite among aquarists of all experience levels. When kept in groups and provided with clean water and a balanced diet, Black Neon Tetras can thrive and add elegant movement to any freshwater aquarium.
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