--- type: species title: "Rummy Nose Tetra Care Guide: Tank Setup, Diet & Tank Mates" slug: "rummy-nose-tetra" category: "freshwater" scientificName: "Hemigrammus bleheri" subcategory: "Tetra" lastUpdated: "2026-04-24" readingTime: 10 url: https://www.fishstores.org/species/rummy-nose-tetra --- # Rummy Nose Tetra Care Guide: Tank Setup, Diet & Tank Mates *Hemigrammus bleheri* Learn how to keep rummy nose tetras healthy — water parameters, tank mates, feeding tips, and what to look for when buying. ## Species Overview Rummy nose tetras (*Hemigrammus bleheri*) are one of the few aquarium fish whose color literally tells you how the tank is doing. The bright crimson flush across their face brightens when conditions are right and pales when they aren't — no pH meter required. That built-in diagnostic, combined with the species' habit of swimming in tight, synchronized schools, has made the rummy nose a benchmark community fish for the planted-tank crowd since the 1970s. They're not, however, a fish to drop into a brand-new tank. Rummy noses come from the soft, acidic blackwater tributaries of the Amazon basin, and they punish ammonia mistakes that a hardier species would shrug off. Set the tank up properly, school them in numbers, and they'll spend years gliding through your aquascape in formation. | Field | Value | | ----------- | --------------------------- | | Adult size | 2 in (5 cm) | | Lifespan | 5-8 years | | Min tank | 20 gallons | | Temperament | Peaceful, tightly schooling | | Difficulty | Intermediate | | Diet | Omnivore (micro foods) | ### Wild Origin & Natural Habitat The true rummy nose tetra is native to the Rio Negro and Rio Madeira tributaries of Brazil and southern Colombia. These are blackwater systems — slow-moving streams stained the color of weak tea by tannins leaching from fallen leaves and submerged wood. The water is warm, soft, and acidic, often dropping below pH 5.5 in the dry season, with hardness near zero. Light penetration in these habitats is poor. The forest canopy and tannin-stained water mean rummy noses evolved under dim, dappled lighting against a dark substrate of decomposing leaf litter. Replicating even a fraction of that environment in a home tank — driftwood, dim lighting, leaf litter — visibly improves their color and reduces stress within days. In the wild they school in groups of hundreds, moving in coordinated walls through the water column. That schooling instinct is hard-wired and isn't optional in captivity. ### Appearance & the "Red Nose" Color Signal The defining feature is the bright red flush that covers the head from the snout back to the gill plate. The body is silver with a faint olive sheen, and the tail carries the species' second signature: alternating black and white horizontal bars on the caudal fin, almost like a striped flag. That red head is more than decoration. It's a real-time stress and water-quality indicator. A healthy fish in clean, stable water shows a vivid, almost neon flush. The same fish in a cycling tank, after a temperature swing, or in a school that's too small will dim within hours — sometimes fading to pale pink or chalky white. Experienced keepers use the color the way a canary works in a coal mine. > **Treat the red nose as a live water-quality gauge** > > The intensity of the red flush is the single fastest visual indicator of how your rummy noses are doing. A fading nose almost always precedes other symptoms by 24-48 hours. If the color drops, test water immediately — ammonia, nitrite, nitrate, and temperature — before you start hunting for disease. ### Size & Lifespan Adults typically reach 1.5 to 2 inches at full size, with females running slightly larger and rounder than males. Growth is slow; expect six to nine months from juvenile to full color and adult length. In a stable, mature tank with good water quality and a varied diet, rummy noses live 5 to 8 years. Most aquarium losses happen in the first 30 days post-purchase, almost always tied to immature tank biology or a school size that's too small to settle the fish in. ## Water Parameters & Tank Requirements Rummy noses need clean, soft, slightly acidic water. They tolerate harder water than their wild origin would suggest, but coloration and breeding success drop the further you stray from natural conditions. ### Ideal Water Parameters Target a temperature of 75-82F (24-28C), pH between 6.0 and 7.0, and general hardness from 2 to 8 dGH. The species sits comfortably in the middle of that range — 78F, pH 6.5, 4 dGH is a reliable target. Stability matters far more than hitting an exact number; bouncing pH between 6.5 and 7.5 weekly is harder on them than parking the tank at a stable 7.2. Ammonia and nitrite must read zero before any rummy nose enters the tank. Nitrate should stay below 20 ppm with weekly water changes. They are noticeably less tolerant of cycling errors than common community species like guppies or zebra danios — there is no such thing as a "fish-in cycle" with this species without losses. ### Minimum Tank Size & Schooling Space Twenty gallons is the practical minimum. A 20-long footprint (30 by 12 inches) is far better than a 20-tall because schooling fish need horizontal swimming space, not vertical depth. For schools of 12 or more — which is where their behavior really starts to shine — a 29 or 40-gallon long is the next sensible step up. Plan for the school first, the fish second. Six rummy noses in a 20-gallon will survive but never display the synchronized formation swimming the species is known for. The tight schooling that draws people to the species only emerges with eight or more individuals, and it gets visibly more disciplined at twelve. > **School size is non-negotiable** > > Six rummy noses is not a school — it's a stressed cluster. The species' signature behavior, the tight coordinated swim display, requires a minimum of 8 individuals and ideally 10-12. Smaller groups chronically stress the fish, dim their color, and shorten their lifespan. If you can't commit to 8+, choose a different tetra. ### Filtration & Flow Rummy noses prefer gentle to moderate flow. They evolved in slow-moving forest streams, not riffles. A quality sponge filter handles a school in a 20-gallon; for larger tanks, a canister with the spray bar aimed at the back glass to break up the current works well. Avoid powerheads and anything that creates a strong directional current across the open swimming zone. Mechanical and biological filtration must be mature before they go in. Because the species is so sensitive to ammonia and nitrite spikes, run the tank for at least four to six weeks with a fishless cycle and confirm zero readings for ammonia and nitrite for a full week before adding fish. If you're keeping the school in a tannin-stained blackwater setup, plan for slightly more frequent biological maintenance. Tannins can drop pH and slow nitrification, so test alkalinity (KH) regularly and add small amounts of crushed coral if KH drops below 1 dKH. ### Lighting & Décor Dim to moderate lighting suits them best. Bright lighting over a bare-bottom tank washes them out and makes them noticeably more skittish. A dark substrate — black sand, dark gravel, or a planted soil cap — combined with floating plants to break up overhead light brings out the strongest coloration. Driftwood, leaf litter (Indian almond leaves, oak leaves, alder cones), and dense planting along the back and sides give them the visual security of their natural habitat. Leave the front-center open as a swimming runway. Tannin release from wood and leaves stains the water amber, lowers pH gently, and is exactly what they evolved in. > **Blackwater enhances coloration** > > Tannins released by Indian almond leaves, alder cones, and driftwood don't just look natural — they actively deepen the red of the rummy nose's flush within a few days. Tannins also have mild antibacterial and antifungal properties, which is part of why blackwater tanks tend to have lower disease pressure overall. ## Diet & Feeding Rummy noses are omnivores with small mouths. Almost any commercial micro food or finely chopped frozen food works, but variety matters more than the specific brand. ### Staple Foods A high-quality micro pellet or crushed flake formulated for small community fish is the daily base. Look for products with whole fish meal or shrimp meal as the first ingredient, not wheat or soy. Crush flakes between your fingers before dropping them — rummy noses won't tear chunks apart the way larger tetras will, and oversized food pieces hit the substrate uneaten. Two to three pellets or a small pinch of crushed flake per fish per feeding is plenty. Their stomachs are roughly the size of an eye. ### Enrichment Foods Two to three times a week, supplement with frozen or live foods. Baby brine shrimp, daphnia, micro worms, cyclops, and finely chopped bloodworms all work. Live baby brine shrimp in particular drives an immediate color and activity response — it's the closest match to their natural diet of small crustaceans and insect larvae drifting in the current. If you culture live foods at home, daphnia is the easiest fit for a soft-water blackwater tank. If you don't, the frozen versions of the same foods are nutritionally close enough. ### Feeding Schedule & Quantity Feed twice daily, with each feeding consumed inside two minutes. Uneaten food is the fastest way to spike ammonia in a soft-water tank with low buffering capacity, so err on the small side and remove anything left after three to five minutes. Skip a day per week. Rummy noses, like most tetras, do better on a slight calorie deficit than on overfeeding. A weekly fast also helps clear digestive tracts and reduces the risk of bloat. In planted tanks with low nitrate targets, fasting one day a week noticeably reduces algae pressure as well. ## Tank Mates & Compatibility Peaceful, similarly sized soft-water community fish are the right match. Avoid anything large, aggressive, or known for fin-nipping. ### Ideal Community Companions Cardinal tetras (*Paracheirodon axelrodi*) are the classic pairing — same water parameters, same temperament, complementary coloration. Other strong matches include neon tetras, ember tetras, lemon tetras, and small rasboras like chili rasboras or harlequin rasboras. For a comparable schooling cohort with very similar care needs, see the [neon tetra care guide](/species/neon-tetra) and the [Congo tetra care guide](/species/congo-tetra) for a larger blackwater tetra option. Bottom-dwelling companions work well: corydoras catfish (especially pygmy or panda corys), kuhli loaches, and otocinclus all share the soft, warm, gentle-flow conditions rummy noses need. Dwarf gouramis and honey gouramis are peaceful enough for the upper water column without competing for swimming space. Shrimp pair fine with adult rummy noses — Amano shrimp, ghost shrimp, and adult cherry shrimp generally go untouched, though shrimplets may get picked off. ### Species to Avoid Skip anything over about four inches as an adult. Angelfish, larger gouramis, and most cichlids see rummy noses as either food or competition for territory. Tiger barbs, serpae tetras, and Buenos Aires tetras will nip at the bright red noses and stress the school chronically. Goldfish and any coldwater species are wrong on temperature alone. Aggressive bottom-dwellers like territorial plecos or larger loaches can disrupt the school's resting periods at night. Stick to small, peaceful tank mates and the fish will reward you. ### Keeping a Proper School Eight is the floor. Twelve is where the species really displays. Below eight, the school doesn't form properly — fish disperse, hide more, eat less, and the red flush dims. The chronic low-grade stress of being in a too-small group also suppresses the immune system, which is why undersized schools see disproportionate losses to common diseases. Use the tightness and synchronization of the school as an ongoing health check. Healthy rummy noses move as a coordinated mass, turning together on the same axis. A school that has fragmented into two or three loose subgroups, or fish that consistently hover alone away from the group, almost always signals a water quality, temperature, or aggression issue worth tracking down. ## Breeding Rummy Nose Tetras Breeding is achievable but not casual. Rummy noses are far less prolific in captivity than neon or ember tetras, and the fry are tiny and demanding. ### Breeding Conditions Set up a separate 10-gallon breeding tank with bare bottom, a fine sponge filter, and a spawning mop or thick mat of java moss. Target pH 5.5 to 6.5, temperature 80-82F, and very soft water (under 2 dGH). Reverse-osmosis water buffered with a small amount of Indian almond leaf extract is the typical recipe. Keep the lighting very dim — close to dark — because the eggs are light-sensitive. Condition a small group (six to eight) on live and frozen foods for one to two weeks in the main tank, then move two or three pairs into the breeding setup. Spawning typically follows within a few days if conditions are right. ### Spawning Behavior & Egg Care Rummy noses are egg scatterers. The pair drives through the spawning mop or moss, releasing and fertilizing eggs that fall into the foliage. Adults will eat the eggs without hesitation, so remove them as soon as spawning ends. Eggs hatch in 24 to 36 hours at 80F. Fry are extremely small and require infusoria or commercial liquid fry food for the first week, then graduating to baby brine shrimp once they're large enough to take it. Survival rates for first-time breeders are often poor; experienced breeders consider rummy noses a moderately advanced project rather than a beginner spawning species. ## Common Health Issues Rummy noses are not delicate fish in a stable tank, but they're disproportionately sensitive to two specific problem categories: poor water quality and protozoan parasites carried in by tank mates. ### Ich & Velvet Ich (*Ichthyophthirius multifiliis*) presents as the classic salt-grain white spots on body and fins. Rummy noses are highly susceptible compared to many community fish. Treat at the first sign — a fading nose followed by visible spots — by raising the temperature gradually to 84F and using an ich medication safe for soft-water tetras. Avoid copper-based treatments at full dose; they're harder on tetras than on hardier species. Velvet (*Oodinium*) shows as a fine gold or rust-colored dust coating, usually most visible on the gills and operculum. It moves faster than ich and is often fatal in soft-water tanks if not treated within a few days. ### Neon Tetra Disease & Bacterial Infections Neon tetra disease (*Pleistophora hyphessobryconis*) is a microsporidian parasite that affects all small tetras, including rummy noses. Symptoms include color loss starting at the head, lumpy or curved spine, and listless swimming away from the school. There is no reliable cure — euthanize affected fish to protect the school and never mix newly purchased tetras directly into an established school without quarantine. Bacterial infections (fin rot, mouth fungus) typically follow a stress event — a temperature swing, a water-change misstep, or a school that's been reduced below eight. Treat the underlying stress first, then medicate with a tetra-safe broad-spectrum antibacterial if symptoms persist. ### Sensitivity to Water Quality Rummy noses tolerate zero ammonia and nearly zero nitrite. A fish-in cycle with this species is a guaranteed loss. Always introduce them only to a fully cycled tank, and follow proper [acclimation procedure](/guides/how-to-acclimate-fish) using a slow drip method over 45 to 60 minutes — they're more sensitive to sudden pH or temperature shifts than most community species. In established tanks, the most common water-quality slip is letting nitrate creep above 30 ppm between water changes, or skipping water changes in a heavily planted tank because the plants "handle it." Plants help, but they don't replace weekly partial water changes. ## Where to Buy & What to Look For Rummy noses are widely available at well-stocked local fish stores and through online vendors, but quality varies enormously. The species is also one of the most commonly mislabeled fish in the trade. ### The Three "Rummy Nose" Species — Sorting Out the Confusion Three different species are sold under the common name "rummy nose tetra," and most fish stores don't distinguish between them: - **True rummy nose** (*Hemigrammus bleheri*) — the species this guide covers. Brightest red, extending past the gill plate, with the most intense schooling behavior. The most commonly sold and the most rewarding to keep. - **Firehead tetra** (*Hemigrammus rhodostomus*) — very similar appearance, slightly less red coverage, often slightly smaller. Care identical to *H. bleheri*. - **False rummy nose** (*Petitella georgiae*) — the original "rummy nose" before *H. bleheri* was formally described in 1986. Slightly less vivid red, body slightly more elongated. Same care requirements. In practice, all three are cared for identically and can be schooled together without issue. The naming confusion matters mostly for breeders and for hobbyists who want the most intense color, where *H. bleheri* generally wins. If you ask a store specifically for *Hemigrammus bleheri* and the staff doesn't know what you're talking about, that's useful information about the store. ### Tank-Raised vs. Wild-Caught Tank-raised rummy noses are noticeably hardier and adapt to a wider range of water parameters than wild-caught specimens. They're also less likely to carry parasites picked up in the supply chain. The trade-off is slightly less intense red color and a smaller adult size. Wild-caught fish are more vibrant, larger, and more delicate. They demand soft, acidic blackwater conditions to thrive and rarely tolerate hard water. For most hobbyists, tank-raised is the right call. Reserve wild-caught for established blackwater specialists with mature, well-controlled tanks. ### Health Checklist at the Fish Store ### What to Look for When Buying Rummy Nose Tetras - [ ] Bright, vivid red flush on the head — pale or chalky pink means stressed or unwell stock - [ ] Tight schooling behavior in the store tank — fish dispersed alone are a warning sign - [ ] Clear, sharp black-and-white tail bars with no fading or fin damage - [ ] Erect, unclamped fins and active swimming in the mid-water column - [ ] No white spots, fuzzy patches, or fine gold dust on body or gills - [ ] Fish actively eating when staff feeds — ask for a feeding before you commit - [ ] Store tank water is clean and tannin-stained (not crystal clear) — a good sign for proper conditions - [ ] No dead fish or visibly sick fish in the same display tank If you're new to acclimating sensitive tetras, work through the [step-by-step fish acclimation guide](/guides/how-to-acclimate-fish) before bringing the bag home. For tank-size planning, see the [20-gallon fish tank guide](/guides/20-gallon-fish-tank) — that's the realistic floor for a proper rummy nose school. And for broader context on building a tetra-friendly community, the [freshwater fish overview](/guides/freshwater-fish) covers compatible species and water-chemistry basics. **Find rummy nose tetras at a local fish store near you** — [Find stores near me](https://www.fishstores.org/near-me) Rummy noses tell you their condition with their color — buy them in person so you can verify the red flush is bright before you pay. A reputable local store will quarantine new arrivals and let you watch them feed. ## Quick Reference - **Tank size:** 20 gallons minimum (20-long preferred); 29+ gallons for schools of 12 - **Temperature:** 75-82F (24-28C) - **pH:** 6.0-7.0 - **Hardness:** 2-8 dGH - **Ammonia / nitrite:** 0 ppm (non-negotiable) - **Nitrate:** under 20 ppm - **School size:** 8 minimum, 10-12 ideal - **Adult size:** 1.5-2 inches - **Lifespan:** 5-8 years in a stable, mature tank - **Diet:** Omnivore — micro pellets, crushed flake, frozen baby brine shrimp, daphnia - **Tank mates:** Cardinal tetras, neon tetras, small rasboras, corydoras, dwarf gouramis, kuhli loaches - **Avoid:** Tiger barbs, serpae tetras, angelfish, cichlids, anything over 4 inches - **Décor:** Dark substrate, driftwood, leaf litter, dim lighting, dense planting on sides and back - **Difficulty:** Intermediate — needs fully cycled, stable soft water ## Frequently Asked Questions ### How many rummy nose tetras should be kept together? Keep a minimum school of 8, ideally 10-12. Rummy nose tetras are tightly schooling fish; smaller groups cause chronic stress, which visibly fades their signature red nose coloration and increases disease susceptibility. ### Are rummy nose tetras hard to keep? They're intermediate-level fish. They demand fully cycled, stable soft-water tanks (pH 6.0-7.0, temp 75-82F) and are sensitive to ammonia spikes. In a mature, well-maintained aquarium they're hardy and long-lived. ### What is the difference between a rummy nose tetra and a cardinal tetra? Cardinal tetras (*Paracheirodon axelrodi*) display a full-length red stripe; rummy nose tetras (*Hemigrammus bleheri*) have a bright red head and a black-and-white forked tail pattern. Both prefer similar soft, acidic water conditions. ### Why is my rummy nose tetra losing its red color? Fading red coloration almost always signals stress or poor water quality — check ammonia, nitrite, and nitrate levels immediately. Other causes include temperature fluctuation, a school that's too small, or early-stage illness. ### Can rummy nose tetras live with bettas? Generally yes, in a 20+ gallon tank with gentle filtration and a betta with a calm temperament. The tetra's fast schooling movement and the betta's flowing fins can occasionally trigger aggression — monitor closely after introduction. --- *Source: [FishStores.org](https://www.fishstores.org/species/rummy-nose-tetra)* *Last updated: April 24, 2026*