Should I buy it?
Rummy Nose Tetra
Hemigrammus rhodostomus
Also known as: rummynose, hemigrammus rhodostomus (trade)
The school-quality benchmark. Red noses mean the water and stress level are right. Pale noses mean something is wrong before the test kit shows it.
Rummy Nose Tetra tank mates · 80L tank size hub
peaceful · intermediate care
Sources & confidencehigh · verified · beginner: caution
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: Mature soft-water planted tanks 100L or more, run for a tight synchronised school.
Avoid if: Your tank is brand new, water is very hard, or you want a low-maintenance fish in a small tank.
Common mistakeAdding a rummy-nose school to a tank under three months old is how keepers invent permanently pale noses and 'failed colour' returns. They signal water problems fast. Only add them to a fully cycled, established tank with a real school — not as a cycling decoration.
Top things that go wrong
- Group welfare — not a solo display fish. Plan at least **8** together for normal behaviour; smaller groups often mean stress, colour loss, or nipping depending on species.
- Specialist husbandry. Schooling species — buy 8+ together. Smaller groups stress and lose colour.
- 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: rummy-nose tetras colour up in any new community kit if you buy enough of them. Reality: pale noses usually mean immature or unstable water — they need an established tank, softish chemistry, and a real school of eight or more before the red reads true.
- 2.Buying three or four to start. Rummy Nose Tetra settles in a group of 8 or more. An understocked school sulks at the back of the tank and loses colour within a fortnight.
- 3.Eight or more for the school to settle. Soft acidic water in a tank running three months or more. Rummies do not survive ammonia spikes in a fresh cycle.
About this species
Rummy-nose tetras are soft-water characins with a red head and a black-barred tail. The school packs tighter when startled. A pale nose is the first sign of stress before nitrates show on a strip.
- Black phantom tetra80L min · same group, comparable tank size
- Columbian Tetra80L min · same group, comparable tank size
- Penguin tetra80L min · same group, comparable tank size
- Rosy Tetra80L min · same group, comparable tank size
- Splash tetra80L min · same group, comparable tank size
- Beckford Pencilfish60L min · same group, similar adult size
- Black Neon Tetra60L min · same group, similar adult size
- Bloodfin tetra60L min · same group, similar adult size
- Adolfoi coryalso intermediate peaceful, similar tank size
- Bamboo Shrimpalso intermediate peaceful, similar tank size
- Black ruby barbalso intermediate peaceful, similar tank size
- Bolivian Ramalso intermediate peaceful, similar tank size
- Brown / hockey-stick pencilfishalso intermediate peaceful, similar tank size
- Cardinal Tetraalso intermediate peaceful, similar tank size
- Apistogramma Borellii tank matesnames this fish as a conditional pairing — read the pair page conditions
- Apistogramma Macmasteri tank matesnames this fish as a conditional pairing — read the pair page conditions
- Apistogramma Trifasciata tank matesnames this fish as a conditional pairing — read the pair page conditions
- Beckford Pencilfish tank mateslists this fish as a safe and recommended mate
- Marbled Hatchetfish tank mateslists this fish as a safe and recommended mate
- Penguin tetra tank mateslists this fish among its safer mates
- Sterba's Corydoras tank mateslists this fish as a safe and recommended mate
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 ease41
- Peacefulness90
- Community fit76
- Small-tank fit100
- Hardiness49
- 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: Cardinal Tetra, Dwarf Gourami.
Prioritise 8+ of Rummy Nose Tetra in 80L+ with filtration sized for messy feeding — add only mates that already pass pair checks with this species.
Compatibility
Tank mates for Rummy Nose Tetra
Usually safer (engine GOOD): Cardinal Tetra, Dwarf Gourami. Conditional (CAUTION — read the pair page before buying): German Blue Ram, 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: Rummy Nose Tetra + Cardinal Tetra
Behaviour and temperament
Rummy-nose tetras are peaceful schoolers that stay calmer in groups of eight or more. They do not police the tank. Stress shows as washed-out noses and tight hiding when water quality slips or the school is too small for comfort.
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
- Eight or more hold midwater with red noses lit in settled softish water.
- Tight schooling after a fright is normal — give length and plants to reform.
- Pale noses after a big water-change miss usually mean chemistry first, not food brand.
- A thin handful that never schools needs more of their own kind in mature water.
- Low listed risk as aggressors toward similar peaceful fish.
- They lose to nippy barbs and predators long before they start wars.
- Fix water maturity before dosing mystery colour meds.
- Remove nippy neighbours at the first torn fin.
Fish behaviour can vary between individuals and tank setups. Always observe new fish closely after introduction.
Water, food, and grouping
Hardness
soft
Diet
omnivore
Rummy-nose tetras are midwater omnivores that take micro-pellets, flake, and frozen foods once a school of eight or more settles in mature softish water. Food monopolised by frantic surface fish leaves them thin. Feed where the school holds, and treat pale noses as a water-quality alarm before you blame the brand of food.
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 8+ together. Smaller groups stress and lose colour.
- Hold 24 to 28 °C steadily on a real thermometer, not the dial on the heater.
- Aim for pH 5.5 to 7 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 8 or more from the same tank on the same day before adding any centrepiece fish.
- Tank volume meets or exceeds 80L published minimum for adults.
- You can stock at least 8 individuals (group welfare).
- Heater can hold 24–28°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 80L minimum tank needs a filter rated for at least 320L/hr turnover and a heater to hold 24–28°C reliably.
Plant suggestions
Rummy Nose Tetra does well in planted tanks. Plants compatible with 24–28°C and pH 5.5–7:
Research: 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. Hemigrammus rhodostomus
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Hemigrammus rhodostomus
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Hemigrammus rhodostomus
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.
Featured compatibility checks
Curated pair pages for Rummy Nose Tetra. Each opens a full verdict — not just a list label.
Common questions about Rummy Nose Tetra
- How big do Rummy Nose Tetra get?
- Adults reach about 5 cm. Small enough that a 10 cm fish will swallow them, large enough to read from across the room.
- What size tank does Rummy Nose Tetra need?
- 100L or more for a school of ten. They need lateral length to spread, not just volume.
- Are Rummy Nose Tetra aggressive?
- Rummy-nose tetras are peaceful schoolers that stay calmer in groups of eight or more. They do not police the tank. Stress shows as washed-out noses and tight hiding when water quality slips or the school is too small for comfort.
- Do Rummy Nose Tetra need to be kept in a group?
- Schooling species — buy 8+ together. Smaller groups stress and lose colour.
- What is the most common mistake with Rummy Nose Tetra?
- Adding a rummy-nose school to a tank under three months old is how keepers invent permanently pale noses and 'failed colour' returns. They signal water problems fast. Only add them to a fully cycled, established tank with a real school — not as a cycling decoration.
- What fish can live with Rummy Nose Tetra?
- The Rummy Nose Tetra profile lists Cardinal Tetra, Dwarf Gourami among its safer pairings (engine-checked GOOD). German Blue Ram, 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.