Neon Tetra Tank Mates

Neon tetras are tiny, peaceful schoolers — they get along with almost any other calm community fish their own size.

The main risk for a neon tetra is being eaten: anything large enough to fit a 3 cm fish in its mouth is a problem, which is why angelfish and other bigger predators are flagged. Kept in a tight school of six or more with similarly-sized, peaceful tankmates, neons are one of the easiest community fish to stock around.

Neon Tetra key facts

The sourced figures the engine uses to judge Neon Tetra pairings.

Top Neon Tetra tank mates

A ranked shortlist: the species the engine clears with Neon Tetra and that suit its size and temperament best — tap a name for its care guide, or use + Add to test the pairing in the planner.

No tank mates match these filters — try removing one. Reset filters

Other engine-cleared options (not necessarily ideal)

These clear TankStocking's hard welfare checks with Neon Tetra, but are larger, bolder, or otherwise less ideal than the shortlist above — read up before committing.

Possible with care

These can work, but the engine flags something to watch — read the reason before you commit.

• Betta (Siamese Fighting Fish) — Territorial
• Paradise Fish — Aggression
• Cockatoo Dwarf Cichlid (Apisto Cacatuoides) — Territorial
• Kribensis (Rainbow Krib) — Territorial

Best avoided

A hard welfare check fires for each of these — don't mix them with Neon Tetra.

• Chocolate Gourami — Temperature clash, Species-only fish
• Dwarf Gourami — Temperature clash
• Kissing Gourami — Predation risk
• Licorice Gourami — Species-only fish
• Moonlight Gourami — Temperature clash
• Snakeskin Gourami — Predation risk
• Three-spot (Blue/Opaline/Gold) Gourami — Predation risk
• Bala Shark — Predation risk
• Denison Barb (Roseline Shark) — Predation risk
• Rosy Barb — Predation risk
• Tinfoil Barb — Predation risk
• Convict Cichlid — Predation risk, Aggression
• Discus — Temperature clash
• Electric Blue Acara — Predation risk

Keeping Neon Tetra well: the detail

Beyond the table — the behaviour, the parameters that actually move the needle, and the mistakes that cost fish. Hobbyist context, not a verdict; the planner above is what judges your plan.

Water parameters in practice

Neons want soft, slightly acidic water on the cooler side — 22–24 °C suits them better than the 27 °C many tropical tanks run at, and their blue is brightest in soft water (under about 8 dGH). They are sensitive to the chemistry swings of a fresh tank, which is exactly where most neon losses happen. A mature, stable tank matters far more than an exact pH reading.

Why Neon Tetra behaves the way it does

Neons come from shaded blackwater streams and flooded forest in the upper Amazon, shoaling in their thousands over leaf litter in tannin-stained, mineral-poor water. The tight schooling is anti-predator behaviour — safety in numbers in open water — which is why a lone or small group reads as nervous and washed-out. Dim light, dark substrate and plants bring out the colour the wild built into them.

Common Neon Tetra stocking mistakes

The biggest mistake is adding neons to a brand-new tank; they need maturity and are the wrong fish to cycle with. The second is buying too few — a group of three or four never relaxes. And the perennial angelfish-and-neon community is a slow-motion error: an adult angel eats neons, which is why the planner flags it.

Early signs something is wrong

Faded blue and red, a fish hanging apart from the school, and a curved spine or body lumps are the cues to act on — the last suggests the incurable, contagious "neon tetra disease", so isolate quickly. Inbred stock is genuinely fragile, so pick lively, well-coloured fish from a busy tank and skip any tank that holds stragglers.

How tank size changes the answer

Ten gallons is the floor for a school of six to eight, but neons look like an afterthought there. A 20-gallon long is where a dozen or more behave like a real shoal — tighter, bolder, and the centrepiece rather than scattered specks. Bigger groups in more water also head off the occasional nipping that bored, under-grouped neons drift into.

Neon Tetra community ideas

Each build is scored by the same engine as the planner — tap one to load it.

Common questions

More on Neon Tetra

Related guides on TankStocking — each scored by the same welfare engine as the planner.

Compatibility is a planning estimate: individual temperament, tank layout, and group sizes all matter. Cycle the tank, add fish gradually, and watch how they behave. See the methodology or browse the full freshwater fish list.