Ember Tetra

Ember tetras are tiny fish with outsized visual impact. At just 0.8 inches fully grown, a school of 10-12 glowing orange-red embers moving through a planted tank is one of the best sights in the nano hobby. They were described scientifically in 1987 and named after Amanda Bleher, the mother of the ichthyologist who collected them. These fish are easy to care for, peaceful with everything, and perfectly suited to planted tanks from 5 gallons up. Their color ranges from a warm amber to a deep burnt orange depending on diet, water conditions, and genetics. In a dimly lit tank with dark substrate and green plants, they look like tiny embers drifting through a forest. If you have a nano tank and want color without complexity, this is the fish.

A 5-gallon tank can house a school of 8-10 ember tetras, though a 10-gallon is better for water stability and gives you room for a cleanup crew. These fish look best in planted tanks. Use fine-leaved plants like java moss, monte carlo, or rotala to create a lush background. Dark substrate (black sand or aquasoil) makes their orange color pop. Floating plants are a nice addition since embers prefer subdued lighting. Filtration should be gentle. A small sponge filter is ideal. Hang-on-back filters work too if you baffle the outflow. Ember tetras stay in the middle and upper water column and rarely interact with the substrate.

Temperature between 73-84 degrees Fahrenheit with 77 as a comfortable target. They are tolerant of a wide temperature range, which is unusual for such a small fish. pH of 5.5 to 7.0 works, with slightly acidic being ideal. Soft water is preferred but they adapt to moderately hard water over time. Weekly 20-25% water changes are sufficient. In a mature, well-planted tank with low bioload, you can stretch to every 10 days. These fish are not demanding about water chemistry as long as conditions are stable and ammonia and nitrite are at zero.

Ember tetras have tiny mouths, so food size matters. Crush regular flakes into powder or use a micro pellet. Frozen baby brine shrimp and frozen cyclops are excellent supplements. Feed a small pinch once or twice daily, just enough for the school to finish in 60 seconds. They will also pick at biofilm and microorganisms on plant surfaces throughout the day. Avoid large pellets or food chunks because they physically cannot eat them. A varied diet brings out the best coloration. Daphnia and spirulina-based foods both help intensify the orange-red color.

Ember tetras are among the most peaceful fish in the hobby. They school loosely, staying in a general cluster rather than tight formation. You will see them drift through the tank as a group, occasionally breaking apart to explore individually before regrouping. There is zero aggression toward other species. Males may display to each other with slightly spread fins, but no harm comes from it. They are not skittish once established but they will hide if kept in a tank with fast, large, or aggressive fish. In a calm nano tank, they are boldly out in the open. They are active during the day and rest among plants at night.

Ember tetras are compatible with almost any small, peaceful species. Cherry shrimp and amano shrimp are perfect tank partners and completely safe. Pygmy corydoras and otocinclus handle the bottom and glass-cleaning duties. Honey gouramis are a good centerpiece addition in a 20-gallon setup. Celestial pearl danios and harlequin rasboras school alongside embers without issues. Even bettas can work if the betta is not particularly aggressive and the tank is 10+ gallons with plenty of plants. Avoid any fish large enough to eat them (angelfish, larger cichlids) or nippy species like tiger barbs. Basically, if the tankmate is peaceful and has a mouth smaller than the ember's body, it is probably fine.

Ember tetras are hardy for their size. Ich is the primary concern, appearing as white spots. Treat by raising temperature to 82 degrees and using ich-specific medication at half dose (small fish are sensitive to medication). Neon tetra disease can occasionally affect ember tetras, causing pale patches and erratic swimming. It is unfortunately not treatable and affected fish should be removed to prevent spread. Fin rot is rare but can happen in poor water conditions. These fish have such a low bioload that water quality problems usually come from overfeeding or insufficient water changes rather than the fish themselves.

Ember tetras scatter eggs among fine-leaved plants and will eat them if they find them. Breeding happens naturally in well-planted tanks, and you may notice tiny fry appearing without any effort on your part. For intentional breeding, set up a small tank (5 gallons) with java moss or spawning mops, dim lighting, and slightly warmer water around 80 degrees. A conditioned pair will scatter eggs over a few hours. Remove the adults after spawning. Eggs hatch in 24-36 hours, and fry are extremely small. They need infusoria or paramecium cultures for the first week before they can take baby brine shrimp. Growth is slow, taking about 3 months to reach adult size.