Ember Tetras Care Guide: Tank Size, Diet & How Many to Keep Together

Ember tetras are one of the best nano fish you can keep. Their fiery orange-red color glows under aquarium lighting, and a large group moving together looks like a living flame. But get the group size wrong and you'll end up with stressed, pale fish that hide all day.

This guide covers everything you need to know about ember tetras: how many to keep, what size tank they need, water conditions, feeding, tankmates, and breeding.

How Many Ember Tetras Should You Keep?

Keep at least 8 ember tetras together. These are shoaling fish — they live in large groups in the wild and feel secure in numbers. Fewer than 8 causes chronic stress, which shows up as faded color, hiding, and a shortened lifespan.

For the best display, aim for 10–15 fish. A tight group of ember tetras darting through a planted tank is one of the most striking sights in the freshwater hobby.

Recommended group sizes by tank:

Always err on the side of more fish. Larger groups behave more naturally and display better color.

About Ember Tetras

Ember tetras (Hyphessobrycon amandae) come from the Araguaia River basin in central Brazil. In the wild, they live in shallow, slow-moving blackwater streams with dense vegetation, fallen leaves, and tannin-stained water.

Adults reach about 0.8 inches (2 cm). Males tend to be slimmer and more intensely colored. Females are slightly rounder when carrying eggs.

These fish are peaceful, active, and non-aggressive. They don't nip fins and won't bother shrimp or snails. That makes them a great choice for any community tank with similarly sized fish.

With good care, ember tetras live 2–4 years.

Tank Size for Ember Tetras

A 10-gallon tank is the minimum for a proper group. Ten gallons gives you enough water volume to keep chemistry stable and enough floor space for 8–12 fish to shoal comfortably.

If you plan a community tank with other species, start with a 20-gallon. More water means more stability and room for everyone.

Choose a wide, long tank over a tall one. Ember tetras are active swimmers in the middle and upper water column — they need horizontal space, not depth. A 20-gallon long (30" × 12" footprint) is better than a 20-gallon high.

A complete aquarium starter kit includes the tank, filter, heater, and lid — everything you need without hunting for individual parts.

Read our 10-gallon tank setup guide for specific equipment recommendations and setup steps.

Water Parameters

Ember tetras adapt well to a range of conditions, but they thrive in soft, slightly acidic water that mimics their native habitat.

If your tap water is hard and alkaline, add driftwood or Indian almond leaves to the tank. Both release tannins that soften the water and lower pH naturally. The water takes on a light tea color — this is called blackwater and it's completely healthy for ember tetras.

Test your water weekly with a reliable test kit, especially during the first few months after setup.

Always dechlorinate before adding water to the tank. Chlorine kills beneficial bacteria and harms fish gills. A quality water conditioner neutralizes chlorine and chloramine in seconds.

Filtration and Flow

Ember tetras come from slow-moving rivers. Strong filter currents stress them and make it harder to eat. Use a sponge filter or a hang-on-back filter with a spray bar to break up the output and reduce flow.

A sponge filter provides excellent biological filtration with gentle flow. It's also safe for fry — the soft intake won't suck up baby fish the way powerhead-style filters can.

Do a 25–30% water change every week. Consistent water changes keep nitrates under control and your ember tetras active.

Check out our freshwater fish care guide for a complete weekly tank maintenance checklist.

What to Feed Ember Tetras

Ember tetras have small mouths. Standard flake food works if you crush it first. Micro pellets (0.5–1 mm) are easier to manage and better for water quality since they don't cloud the tank.

Good staple foods:

• Micro pellets
• Crushed flake food
• Nano pellets made for small tropical fish

Treat foods (2–3 times per week):

• Baby brine shrimp (live or frozen)
• Daphnia (live or frozen)
• Micro worms
• Bloodworms in very small amounts

Feed small amounts twice a day — only what your fish eat in 2–3 minutes. Remove uneaten food to prevent ammonia spikes. Overfeeding is one of the most common causes of water quality problems in small tanks.

Live and frozen foods produce the most intense color and condition fish for breeding.

Best Tankmates for Ember Tetras

Ember tetras get along with virtually everything their own size. They work well in peaceful community tanks and rarely cause problems.

Great tankmates:

• Pygmy corydoras — excellent bottom-level cleaners
• Chili rasboras or lambchop rasboras
• Celestial pearl danios
• Neon or cardinal tetras
• Endler's livebearers
• Dwarf shrimp (cherry shrimp, amano shrimp)
• Nerite and mystery snails

Avoid:

• Fish large enough to eat them — most cichlids, large tetras, goldfish
• Fin-nippers like tiger barbs or serpae tetras
• Aggressive species that outcompete them for food
• Some bettas (results vary — watch carefully if you try it)

Ember tetras and dwarf shrimp make an especially attractive combination. Adult cherry shrimp are too big to eat, and the contrast between the orange-red fish and brightly colored shrimp looks fantastic in a planted tank.

Aquascaping for Ember Tetras

These fish look best in a heavily planted tank with dark substrate. Dark backgrounds make their fiery color pop dramatically.

Recommended plants:

• Java fern — tough, low-light, attaches to rocks and driftwood
• Anubias — tie it to wood, extremely low maintenance
• Cryptocoryne wendtii — good midground plant with warm coloring
• Java moss — perfect for breeding, provides dense cover
• Floating plants (frogbit, dwarf water lettuce) — diffuse light and mimic natural canopy

Add a piece of driftwood to the tank. It releases tannins slowly, naturally conditions the water, and gives shy fish somewhere to retreat. Dried Indian almond leaves on the substrate look natural and further soften the water.

Dim, diffused lighting is ideal. Ember tetras are more active and show brighter color under soft light. If you're growing live plants, a standard low-to-medium LED on a 10–12 hour timer is more than sufficient.

Breeding Ember Tetras

Ember tetras breed readily without much intervention. In a well-maintained planted tank, you may find tiny fry appearing among the plants without ever setting up a dedicated breeding tank.

To encourage spawning:

1. Keep a group of at least 10 fish with a balanced male-to-female ratio
2. Set the temperature to 75–77°F (24–25°C)
3. Feed live or frozen foods daily for 1–2 weeks
4. Make sure there's fine-leafed vegetation like java moss for egg deposition

Females scatter small, transparent eggs among the plants. The eggs hatch in 24–36 hours. If you want to raise fry, transfer a clump of egg-laden java moss to a separate container immediately after spawning — adults eat the eggs if given the chance.

Fry are very small. For the first week, feed infusoria or commercial liquid fry food. After 7–10 days, switch to baby brine shrimp. After a month, they accept micro pellets and other nano foods.

Common Health Issues

Ember tetras are hardy, but problems can develop quickly in small tanks where water quality shifts fast.

Faded or washed-out color: The most common complaint. Usually caused by group size under 8, stress from aggressive tankmates, or poor water quality. Start with a water test.

Ich (white spots): Very treatable. Raise the temperature to 82°F (28°C) and use an ich treatment or aquarium salt. Treat the whole tank, not just the affected fish.

Clamped fins: Usually signals bacterial infection or a sudden drop in water quality. Do an immediate 30% water change and test your parameters.

Not eating: Normal for newly added fish during the first few days. If it continues after a week, check temperature and test for ammonia.

Ember Tetra Quick Care Reference

Ember tetras are one of the best choices for a small planted tank. Keep them in groups of 10 or more, stay on top of weekly water changes, and pair them with peaceful tankmates — they'll reward you with years of vibrant color and active, natural behavior.

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