Rummynose Tetra Tank Mates

Rummynose tetras are peaceful, tightly-schooling tetras — and a living water-quality gauge, their red noses fade when stressed.

They shoal more tightly than almost any other tetra, which makes a big group mesmerising, and they are gentle enough to pair with most peaceful community fish. Because they are larger than neons, they also work as dither fish for angelfish. They want clean, stable, warm water.

Rummynose Tetra key facts

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

Top Rummynose Tetra tank mates

A ranked shortlist: the species the engine clears with Rummynose 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 Rummynose 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
• Convict Cichlid — Aggression
• Jewel Cichlid — Aggression
• Kribensis (Rainbow Krib) — Territorial
• Rainbow Shark — Aggression
• Redtail Black Shark — Aggression

Best avoided

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

• Chocolate Gourami — Species-only fish
• Kissing Gourami — Predation risk
• Licorice Gourami — Species-only fish
• Snakeskin Gourami — Predation risk
• Bala Shark — Predation risk
• Rosy Barb — Temperature clash
• Tinfoil Barb — Predation risk
• Discus — Temperature clash
• Electric Blue Acara — Predation risk
• Firemouth Cichlid — Predation risk, Territorial
• German Blue Ram — Temperature clash
• Green Severum — Predation risk
• Multifasciatus Shell-Dweller — Territorial, Species-only fish
• Oscar — Predation risk, Aggression

Keeping Rummynose 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

Rummynose tetras want warm, soft, clean, acidic water (24–27 °C, pH 5.5–7, soft) and they tell you when they have it — the red nose is a living water-quality gauge that fades the moment conditions slip. They are a touch more demanding than a harlequin and reward a mature, stable, well-filtered tank. Chase steadiness, and the nose does your testing for you.

Why Rummynose Tetra behaves the way it does

Rummynose come from the soft, warm blackwaters of the lower Amazon and shoal more tightly than almost any other tetra — a dense, coordinated ball that turns as one. That extreme schooling is anti-predator behaviour in open water, and it only appears in a proper group. The bright red head is both a health signal and a way the school stays cohesive.

Common Rummynose Tetra stocking mistakes

The first mistake is too small a group, which breaks the tight schooling that is the whole point — eight is the minimum, a dozen far better. The second is adding them to an immature or unstable tank, which they signal by losing the red. The third is keeping them too cool; they want the warm end.

Early signs something is wrong

A pale or pinkish nose instead of vivid red is the early warning — read it as poor water quality, a too-small school, or a not-yet-settled tank. A fish swimming apart from the ball is another. When the noses are crimson and the school moves as one, your water and stocking are right.

How tank size changes the answer

Eight in a 20-gallon long is the floor, but rummynose are made for numbers — fifteen or twenty in a longer, planted tank produce a shoal that is hard to look away from. They are large and fast enough to serve as dither fish for an angelfish in a big enough tank. Give them open mid-water to school in.

Rummynose Tetra community ideas

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

Common questions

More on Rummynose 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.