Ember Tetra Care Guide: Tank Setup, Diet, and Tank Mates

Species Overview#

Ember tetras (Hyphessobrycon amandae) are tiny fiery-orange schooling fish from the Araguaia River basin in central Brazil. Adults rarely exceed 0.8 inches (2 cm), making them one of the smallest true tetras in the hobby. A tight school of 12 in a planted tank looks exactly like the name suggests — drifting embers glowing against green stems and dark substrate. They've been a nano-aquascaping favorite since the species was formally described in 1987, and they remain one of the most beginner-friendly schooling fish available.

They are easier to keep than chili rasboras and more colorful than most equally small species. The trick is treating them like the genuine nano fish they are — soft acidic water, very low flow, food sized for a sub-millimeter mouth, and a school large enough that the fish actually act like a school.

Adult size

0.8 in (2 cm)

Lifespan

2-4 years

Min tank

5 gallons (school of 8+)

Temperament

Peaceful, schooling

Difficulty

Beginner

Diet

Micropredator omnivore

Natural Habitat#

Hyphessobrycon amandae lives in the slow-moving, heavily vegetated tributaries of the Araguaia River basin in Brazil's Mato Grosso and Tocantins states. The water is soft, mildly acidic, and stained with tannins from decaying leaves and submerged wood. Visibility is moderate, current is almost nonexistent, and dense overhead canopy keeps direct sunlight from reaching most of the water column.

The substrate in these habitats is a layer of leaf litter and fine sediment rather than gravel or sand, and the banks are choked with marginal vegetation that drops into the water. Recreating even a softened version of this environment — dark substrate, dim lighting, and some botanicals — has a visible effect on coloration within days of setup.

Appearance & Size#

The body is a saturated red-orange that intensifies on dominant males, with a subtle dark lateral marking that's most visible behind the eye and across the caudal peduncle. Fins carry red-orange highlights, and the eye has a vivid blue iridescent ring that catches light against the warm body color. Females are slightly larger, rounder in the belly when carrying eggs, and noticeably paler than males.

Adult size tops out at about 0.8 inches (2 cm), with most aquarium specimens settling between 0.6 and 0.75 inches. They are sometimes confused with juvenile serpae tetras or smaller Hyphessobrycon species in shop tanks — the small adult size, lack of vertical bars, and uniform red-orange body are diagnostic.

Lifespan#

Well-kept ember tetras typically live 2-4 years in the home aquarium. That's shorter than chili rasboras (4-8 years) and most other small tetras, and it's a function of their small body mass and high metabolism rather than poor husbandry. Stable water parameters, a properly cycled tank, and avoidance of temperature extremes are the biggest predictors of longevity.

Most first-year losses trace back to fish-in cycling, sudden chemistry shifts during water changes, or stress from inadequate school size. A group of 3-4 in a 5-gallon tank rarely thrives; a group of 10-12 in a planted 10-gallon almost always does.

Water Parameters & Tank Requirements#

Get the chemistry stable before the fish arrive. Ember tetras tolerate a wider parameter range than chili rasboras, but tolerance is not the same as thriving. Aim for the middle of each range and hold it steady — swings hurt them more than any single reading.

Ideal Water Parameters#

Target a temperature of 73-84°F (23-29°C). The sweet spot for color and activity is 76-80°F. Temperatures above 82°F shorten lifespan and increase respiration stress; below 73°F slows metabolism and weakens immune response.

Aim for pH 5.5-7.0, with 6.0-6.8 ideal. Hardness should sit between 1 and 10 dGH. Ember tetras handle moderately hard tap water better than chili rasboras do, but soft, slightly acidic water produces the deepest color and the most active schooling behavior. If your tap reads above 8 dGH or above pH 7.5, blend with RO water at roughly 50/50 to soften before water changes.

Cycle the tank fully — zero ammonia, zero nitrite, measurable nitrate — before introducing any livestock. There are no shortcuts for this species, and a fish-in cycle on a 0.8-inch fish almost always ends in losses.

Tank Size & Stocking#

A 5-gallon tank is the practical minimum for a school of 6-8 ember tetras, but a 10-gallon planted tank is where this species really shines. A 10-gallon comfortably holds a school of 10-12 with cherry shrimp, a small bottom-dweller like pygmy corydoras, and dense plant cover. The visual payoff of a tight school of 12 ember tetras in a heavily planted nano is the reason aquascapers reach for this species over and over.

The Fluval Flex 9 or 15 gallon is a strong off-the-shelf option — the curved front, built-in filter chamber, and adjustable LED give you everything you need without a custom build. Dense planting matters as much as raw gallonage. Ember tetras feel exposed in open tanks; give them stem plants, floating cover, and shaded thickets and they'll occupy the entire water column with confidence.

Filtration & Flow#

A sponge filter is the gold standard for ember tetra tanks. It provides gentle biological filtration without the ripping current of a hang-on-back filter, and the sponge surface won't shred shrimp fry. For a 10-gallon nano with embers and shrimp, a single sponge filter rated for a 20-gallon tank is appropriate.

If you prefer a hang-on-back or small canister, baffle the output with a sponge prefilter or flow diffuser. Ember tetras are weak swimmers — visible drift across the tank from filter return current means the flow is too high. They should be holding position in the open water column, not getting pushed into corners.

Aquascape & Lighting#

Dark substrate intensifies the red-orange. A black or dark-brown sand or fine gravel makes the embers pop in a way that white or natural-tan substrate never will. Pair it with green stem plants, a piece of driftwood for tannin release, and floating plants up top to filter the light.

Lighting should be low to moderate. Floating plants — red root floaters, dwarf water lettuce, salvinia, frogbit — diffuse light, provide overhead cover, and recreate the dappled canopy of their wild habitat. A heavily lit open tank stresses the fish into hiding and washes their color toward pale yellow.

Diet & Feeding#

Ember tetras are micropredators that pick zooplankton, insect larvae, and tiny crustaceans from the water column. Their mouths are sub-millimeter at the gape, which makes food particle size the deciding factor in whether they actually eat what you put in the tank.

What Ember Tetras Eat#

The best staples are micro-pellets, finely crushed flake, and small live or frozen items. Look for products marketed for nano fish or fry — Hikari Micro Pellets, Bug Bites Nano, Omega One Micro Pellets, and similar work well as the dry-food backbone.

Live & Frozen Foods#

Baby brine shrimp (freshly hatched), daphnia, micro worms, and cyclops are excellent supplements 2-3 times per week. Live foods trigger active hunting behavior across the tank and visibly boost coloration within days. If you can culture micro worms or vinegar eels, the running cost is near zero and the school will stay engaged and conditioned.

Frozen daphnia and frozen baby brine shrimp store well and serve as easy backup staples. A small cube of frozen daphnia for a school of 10-12 embers is roughly the right portion.

Feeding Schedule & Quantity#

Feed twice daily in small amounts — only what the school can clear within 2-3 minutes. In a low-flow nano tank, overfeeding is the fastest route to ammonia spikes. A pinch of crushed flake or a teaspoon of just-hatched baby brine for a school of 12 is plenty.

Skip a feeding day every 7-10 days. It gives their systems a break, lets the bioload settle, and makes no difference to fish health — wild ember tetras don't eat on a fixed schedule either.

Tank Mates & Compatibility#

Ember tetras are peaceful, social, and easy to pair with other nano species. Their main constraint is size: anything large enough to swallow a 0.8-inch fish is off the table, and anything aggressive enough to harass them at feeding time will out-compete them.

Best Community Companions#

Other nano fish make ideal tank mates. Chili rasboras, harlequin rasboras (in tanks 15+ gallons), pygmy corydoras (Corydoras pygmaeus or C. hastatus), sparkling gouramis, and other small Hyphessobrycon species all coexist well. A textbook nano community is a 15-gallon planted tank with 12 ember tetras, 8 chili rasboras, and a small group of pygmy corys — three species, three water-column zones, zero conflict.

Neon tetras work in larger tanks (20+ gallons) but can out-compete embers at feeding time in tight quarters. Honey gouramis are a popular centerpiece pairing for a 15-20 gallon ember tetra tank — peaceful, slightly larger, and they don't bother the school.

Invertebrate Compatibility#

Ember tetras are excellent shrimp tank mates. Adult red cherry shrimp, blue dream shrimp, amano shrimp, and most caridina species are completely safe — the embers' mouths are too small to harm a 1-inch adult shrimp. They'll occasionally pick off newborn shrimplets, but in a planted tank with moss, almond leaves, and dense ground cover, enough babies survive to maintain a stable colony.

Snails are equally safe. Nerite snails, ramshorns, mystery snails, and Malaysian trumpet snails coexist with ember tetras with zero issues. If you want a peaceful planted tank with mixed inverts and one warm-colored fish species, this is one of the best combinations in the hobby.

Fish to Avoid#

Skip anything large enough to fit an ember tetra in its mouth — angelfish, larger gouramis, dwarf cichlids over 3 inches, adult goldfish, and most barbs. Avoid known fin-nippers (tiger barbs, serpae tetras, black skirt tetras) regardless of size. Goldfish and ember tetras are biologically incompatible — different temperature ranges, different chemistry preferences, and goldfish will eventually outgrow and outcompete embers in any shared tank.

Bettas with ember tetras is a case-by-case call. Embers don't have flowing fins to nip, and their schooling behavior usually keeps them out of the betta's territorial zone. In a 10+ gallon planted tank with cover, the pairing works more often than not. In a 5-gallon, it's a gamble. For broader stocking guidance, see the freshwater fish guide.

Breeding Ember Tetras#

Ember tetras spawn readily in soft, acidic water given proper conditioning, but raising fry takes patience and live food cultures. They are egg scatterers with no parental care — adults will eat eggs and fry given the opportunity.

Conditioning & Spawning Triggers#

Condition the breeders for 1-2 weeks on a varied diet of live baby brine, daphnia, and micro worms. Move conditioned pairs (or a small group of 2 males to 4 females) to a separate breeding tank with mature, soft, acidic water (pH 5.5-6.5, sub-3 dGH hardness), peat-filtered water or botanicals for tannin release, and a slight temperature bump to 78-80°F. Java moss or a fine-leaved spawning mop gives the eggs somewhere to land out of reach of adult mouths.

Dim lighting and a sense of cover trigger spawning faster than a brightly lit open tank. Most pairs spawn within a few days of being moved into proper conditions.

Egg Care & Fry Raising#

Adults scatter eggs into plants and substrate, then immediately try to eat them. Remove the adults right after spawning. Eggs hatch in 24-48 hours, and fry are tiny — too small for newly hatched baby brine for the first 5-7 days.

Start fry on infusoria, paramecium cultures, or commercial liquid fry food (Sera Micron, Hikari First Bites at the smallest particle size). Switch to baby brine once they're large enough to handle it (around day 7-10). Expect a slow grow-out — fry take 2-3 months to reach saleable size, and survival rates depend almost entirely on water quality and food availability during the first 2 weeks.

Common Health Issues#

Ember tetras are not particularly disease-prone, but their tiny body mass means treatments and stressors hit harder than they would on a larger fish. Prevention through water quality and quarantine is far more effective than reactive treatment.

Ich & Velvet#

Ich (Ichthyophthirius multifiliis) presents as small white spots on the body and fins. It's most common at the lower end of the temperature range (below 74°F) and after stressful events like shipping. Treat by raising temperature to 82°F gradually and using an ich-specific medication at the lowest effective dose — ember tetras are sensitive to copper and full-strength malachite green. Dose for actual tank volume, not the labeled "average tank size."

Velvet (Piscinoodinium) is harder to spot — a fine gold or rust-colored dust on the body, often visible only in side-lighting. It progresses faster than ich and can wipe out a school in a few days. Treatment requires careful low-dose copper or formalin protocols.

Neon Tetra Disease & Bacterial Infections#

Neon tetra disease (Pleistophora hyphessobryconis) is a microsporidian parasite that affects ember tetras as well as neons. Symptoms include faded color, loss of body mass, lumpy body shape, and erratic swimming. There is no cure — infected fish should be removed and euthanized to prevent spread, and any new fish should be quarantined for 3-4 weeks before introduction.

Bacterial infections in ember tetras almost always trace back to water quality. Cloudy eyes, fin rot, or sudden lethargy in one fish in a stable group usually means a parameter has slipped. Test ammonia, nitrite, nitrate, and pH first before reaching for medication. A water change with parameter-matched water often resolves early-stage symptoms without antibiotics.

Stress & Color Loss#

Pale coloration is the single most reliable health indicator in ember tetras. A vivid orange-red school is a healthy school; faded yellow-orange fish are stressed. The three most common root causes are poor water quality (test your parameters), a school that's too small (under 8 individuals), and incompatible or aggressive tank mates. Fix the underlying cause and color usually returns within a week.

Where to Buy & What to Look For#

Ember tetras are widely available in the trade — most major US online vendors carry them, and any local fish store with a serious freshwater section should stock them or be able to order. Where you buy matters less than how the fish were handled in the supply chain.

Selecting Healthy Specimens at Your LFS#

Look for active schooling behavior. A healthy ember tetra group stays together in the open water column or hovers as a unit near plants — not scattered individuals hugging corners or hanging at the surface. Coloration should be vivid orange-red on at least the dominant fish; faded, washed-out fish typically indicate stress or recent shipping arrival.

Check carefully for clamped fins, white spots, fungal patches, or any "fuzzy" outline along the body. A school of 20 in a store tank should have zero visible disease — if you see one obviously sick fish, the whole batch is at risk. Ask staff how long the fish have been in-store; ideally they've settled for at least a week, and the staff should be feeding them visibly during your visit.

Online vs. Local Fish Store#

Local fish stores let you inspect the fish in person, watch them eat, and ask about source and time-in-store. Captive-bred ember tetras (which dominate the trade these days) adapt to standard tap water more readily and arrive less stressed than wild-caught specimens that may have crossed multiple borders.

Online sourcing offers wider color and sourcing options but adds shipping stress. If you order online, schedule arrival for a midweek delivery (avoid Friday-Saturday delivery windows where the fish may sit overnight in a sorting facility), and have a quarantine tank fully cycled and parameter-matched before the box lands. For your first ember tetra purchase, the LFS route is the safer bet — you can verify the fish are healthy and eating before you commit.

Quick Reference#

• Adult size: 0.8 in (2 cm)
• Lifespan: 2-4 years
• Tank size: 5 gallons minimum (school of 6-8); 10+ gallons preferred
• Group size: 8 minimum, 10-12 ideal
• Temperature: 73-84°F (23-29°C), sweet spot 76-80°F
• pH: 5.5-7.0 (optimal 6.0-6.8)
• Hardness: 1-10 dGH
• Filtration: Sponge filter, very low flow
• Diet: Micro-pellets, crushed flake, baby brine, daphnia, micro worms (under 0.5 mm particle size)
• Feeding: 2x daily, small portions
• Best tank mates: Chili rasboras, harlequin rasboras, pygmy corys, sparkling gouramis, cherry shrimp
• Avoid: Angelfish, larger gouramis, goldfish, fin-nippers, anything over 2 in
• Difficulty: Beginner with stable water parameters
• Lighting: Low to moderate; floating plants for cover
• Substrate: Dark sand or fine gravel intensifies color
• Decor: Heavy planting, driftwood, botanicals (Indian almond leaves) for tannins