Should I buy it?
Black Neon Tetra
Hyphessobrycon herbertaxelrodi
Also known as: black neon, hyphessobrycon herbertaxelrodi
Tougher than regular neons in moderately hard water. The horizontal bar develops full colour at pH 6.5–7.2. A reliable community schooler.
Black Neon Tetra tank mates · 60L tank size hub
peaceful · beginner care
Sources & confidencehigh · partially verified · beginner: excellent
Checked against several solid care sources that mostly agree. Numbers here are a careful starting point. Your tap water, tank size, and habits decide the rest. How we evaluate.
Best for: Community tanks 60L or more with neutral to soft water and a school of eight or more.
Avoid if: You keep large cichlids or any predatory fish that eats 4 cm fish.
Common mistakeBuying only four black neons as a 'sample shoal' is how keepers invent a dull, non-schooling handful that never shows the bar pattern in motion. Four fish do not school. Budget for eight or more in at least 60L, or wait until you can.
Top things that go wrong
- Group welfare — not a solo display fish. Plan at least **6** together for normal behaviour; smaller groups often mean stress, colour loss, or nipping depending on species.
- Shrimp & snails. Cherry shrimp and other dwarfs can coexist with peaceful small fish; baby shrimp are food for almost anything that finds them.
What most shops don't tell you
- 1.Myth: four black neon tetras are enough to start a community school. Reality: they need six or more — preferably eight — before they school and show the bar pattern; token numbers hide and look like a failed species in the glass.
- 2.Buying three or four to start. Black Neon Tetra settles in a group of 6 or more. An understocked school sulks at the back of the tank and loses colour within a fortnight.
- 3.More forgiving of pH swings than the true neon. Six or more or the school dulls and hides.
About this species
- Beckford Pencilfish60L min · same group, comparable tank size
- Bloodfin tetra60L min · same group, comparable tank size
- Cardinal Tetra60L min · same group, comparable tank size
- Glowlight Tetra60L min · same group, comparable tank size
- Green neon tetra60L min · same group, comparable tank size
- Lemon Tetra60L min · same group, comparable tank size
- Silver Tip Tetra60L min · same group, comparable tank size
- X-ray tetra60L min · same group, comparable tank size
- Amano Shrimpalso beginner peaceful, similar tank size
- Assassin Snailalso beginner peaceful, similar tank size
- Beckford Pencilfishalso beginner peaceful, similar tank size
- Black phantom tetraalso beginner peaceful, similar tank size
- Bloodfin tetraalso beginner peaceful, similar tank size
- Blue Dream Shrimpalso beginner peaceful, similar tank size
No reverse lookups listed yet.
Plan grid
Key limits are above. Here: pH band, swim level, bioload, and activity.
Swim zones
Care snapshot
Quick compare before you buy. Not a score of how “good” the fish is.
- Beginner ease82
- Peacefulness90
- Community fit83
- Small-tank fit100
- Hardiness76
- Energy54
Numbers are deterministic planning indices from Fishori fields — not a scientific score of your individual fish.
Example setups
Starting points only. Run the pair checker for every fish you add.
Rough 90L+ layout: one calm centrepiece, 8–12 small tetras/rasboras, 6–8 corydoras-type bottom fish — verify every name in the pair checker before buying.
Safer directions include: Cherry Barb, Dwarf Gourami, Harlequin Rasbora.
Prioritise 6+ of Black Neon Tetra in 60L+ with filtration sized for messy feeding — add only mates that already pass pair checks with this species.
Compatibility
Tank mates for Black Neon Tetra
Usually safer (engine GOOD): Cherry Barb, Dwarf Gourami, Harlequin Rasbora, Neon Tetra. Conditional (CAUTION — read the pair page before buying): Corydoras Catfish, Tiger Barb. Avoid (RISKY): Jack Dempsey, Oscar. Every name links to a live pair check — the lists are a shortlist, not a stocking plan.
Usually safer
Open a pair page with this fish as the starting point.
Needs planning
Read the blocking rule on each pair page before experimenting.
Usually avoid
Do-not-stock combinations on conservative hobby rules.
Compare with
Run a real pair check: Black Neon Tetra + Cherry Barb
- Try Cherry Barb — open the pair check.
- Try Dwarf Gourami — open the pair check.
- Try Harlequin Rasbora — open the pair check.
- Try Neon Tetra — open the pair check.
Behaviour and temperament
Black neon tetras are peaceful schoolers that stay calmer in groups of six or more fish together. They do not bully robust neighbours. Stress shows as hiding and washed-out bars when under-grouped or housed with nippy barbs in a short tank.
What sets them off
- Sudden crowding
- Poor water quality
Fin nipping: Not a habitual fin-nipper; stressed or crowded individuals can still test fins.
Predation: Not a predator toward similarly sized community fish; fry and dwarf shrimp are still fair game for most species.
Territory: Not strongly territorial, but still needs room so its working space does not overlap the next fish.
Planted tanks: excellent — easy plant ideas
In the glass: typical and warning signs
- Six to eight or more hold midwater with black-and-white bars flashing together.
- Mild school shuffle is normal ownership in planted softish water.
- A scattered four-fish group usually needs more of their own kind first.
- Torn fins after tiger barbs arrive mean neighbour choice failed.
- Low listed risk as aggressors.
- They get bullied long before they start community wars.
- Increase school size before chasing mystery colour fixes.
- Remove nippy neighbours at the first tear.
Fish behaviour can vary between individuals and tank setups. Always observe new fish closely after introduction.
Water, food, and grouping
Hardness
soft
Diet
omnivore
Black neon tetras are small midwater omnivores that take micro-pellets, flake, and frozen foods in a school of six or more — eight looks better. Food that only hits the sand leaves them thin. Feed where the school holds among plants in softish water, and keep numbers honest so the bar pattern reads in motion.
Shrimp & snails
Cherry shrimp and other dwarfs can coexist with peaceful small fish; baby shrimp are food for almost anything that finds them.
Schooling species — buy 6+ together. Smaller groups stress and lose colour.
- Hold 22 to 28 °C steadily on a real thermometer, not the dial on the heater.
- Aim for pH 5.5 to 7.5 and a hardness you can re-test in two weeks. A one-time strip in the shop car park is not a water test.
- Schooling species. Buy 6 or more from the same tank on the same day before adding any centrepiece fish.
- Tank volume meets or exceeds 60L published minimum for adults.
- You can stock at least 6 individuals (group welfare).
- Heater can hold 22–28°C without cooking cooler-water tank mates.
Explore and stocking hubs
Tank-mates hub, matching guides, category peers, and litre stocking lists around this species’ minimum tank.
Plan with tools
Check mates as pairs first, then add this fish in the tank builder for the full stocking.
Filtration & heating
A 60L minimum tank needs a filter rated for at least 240L/hr turnover and a heater to hold 22–28°C reliably.
Plant suggestions
Black Neon Tetra does well in planted tanks. Plants compatible with 22–28°C and pH 5.5–7.5:
Research: partially verified · Confidence: high · 3 linked source(s). We do not invent citations.
How Fishori evaluates compatibility (same logic as pair and tank tools).
- Seriously Fish. Hyphessobrycon herbertaxelrodi
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Hyphessobrycon herbertaxelrodi
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Hyphessobrycon herbertaxelrodi
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
Evidence notes
- The Seriously Fish profile for the binomial in this record was successfully reached as the primary aquarium reference.
- FishBase contributes natural-range size and habitat context. Translate those numbers through your heater, your water report, and your tank footprint before stocking.
- Wikipedia is only cited if the article URL returned OK. Use it for orientation, not as the only care sheet for an import.
- All compatibility text reflects typical hobby experience and the Fishori model. Individual fish, shop stress, and the order tank mates are added in can still defy a single-paragraph label.
Common questions about Black Neon Tetra
- How big do Black Neon Tetra get?
- Black Neon Tetra adults reach about 4 cm. Shop fish look smaller; stock for the adult length.
- What size tank does Black Neon Tetra need?
- 60L is the planning floor for adult swimming space and bioload. A 73L+ tank is the more comfortable long-term footprint. Length and depth matter as much as raw litres for active or territorial fish.
- Are Black Neon Tetra aggressive?
- Black neon tetras are peaceful schoolers that stay calmer in groups of six or more fish together. They do not bully robust neighbours. Stress shows as hiding and washed-out bars when under-grouped or housed with nippy barbs in a short tank.
- Do Black Neon Tetra need to be kept in a group?
- Schooling species — buy 6+ together. Smaller groups stress and lose colour.
- What is the most common mistake with Black Neon Tetra?
- Buying only four black neons as a 'sample shoal' is how keepers invent a dull, non-schooling handful that never shows the bar pattern in motion. Four fish do not school. Budget for eight or more in at least 60L, or wait until you can.
- What fish can live with Black Neon Tetra?
- The Black Neon Tetra profile lists Cherry Barb, Dwarf Gourami, Harlequin Rasbora, Neon Tetra among its safer pairings (engine-checked GOOD). Corydoras Catfish, Tiger Barb are conditional (CAUTION): workable only with the specific conditions on each pair page. Avoid Jack Dempsey, Oscar (RISKY). Run the pair checker for your exact water and tank size before stocking.