Bloodfin Tetra Care Guide: The Hardy, Red-Finned Schooling Fish
The Bloodfin tetra (Aphyocharax anisitsi) is a hardy, fast-moving schooling fish prized for its silvery body and brilliant blood-red fins. Native to the Paraná river basin of South America, it is one of the toughest and most adaptable tetras in the hobby — a fantastic choice for beginners who want an active, eye-catching community fish. Here at Tropical Treasures in Cheyenne, Bloodfins are a go-to recommendation for lively, low-fuss schoolers.
We regularly keep the Bloodfin Tetra in stock, along with its close cousin the Green Fire Tetra (also an Aphyocharax species with the same easygoing temperament). Browse the full tetras collection to see what is swimming right now — our stock rotates often, so message us and we will tell you what is currently available.
Meet the Bloodfin tetra
Bloodfin tetras grow to about 2 inches and are built for speed — streamlined, silvery, and flashing red on the tail, anal, and dorsal fins. The red coloration deepens as the fish mature and is most striking on well-fed adults in a planted tank. They are peaceful shoaling fish that are happiest in groups, where they swim tirelessly in the upper and middle water column. Their hardiness and energy make them a great fit for community tanks and beginner setups alike.
Tank Size and Setup
Because Bloodfins are active, fast swimmers, give them horizontal swimming room — a 20-gallon long or larger is ideal, though a well-maintained 15 gallon can work for a small group. Always keep them in a school of at least 6, and ideally 8 or more; a larger group reduces skittishness and brings out their best color and behavior.
Aquascape with a darker substrate to make the red fins pop, and frame the tank with live plants around the edges while leaving open water in the middle for swimming. A few floating plants help diffuse the light and make the fish feel secure. A snug lid is essential — Bloodfins are notorious jumpers.
Water Parameters and Temperature
One of the Bloodfin’s biggest strengths is its adaptability. They thrive across a wide range, roughly pH 6.0–8.0 and a temperature of 64–82°F, which makes them more forgiving of cooler rooms than many tropical fish. Aim for the 72–78°F range for everyday keeping. As with any fish, stability matters most: keep them in a fully cycled tank and stay on top of regular water changes.
A reliable heater keeps temperatures steady through a Wyoming winter. As a rough sizing guide, plan on about 50 watts for a 7–16 gallon tank, 75 watts for 16–26 gallons, and 100 watts for a 26–40 gallon setup. Pair the heater with gentle to moderate filtration — Bloodfins enjoy a little current — and a quality fish food routine to keep water clean.
Feeding Your Bloodfin tetra
Bloodfin tetras are unfussy omnivores and enthusiastic eaters. A quality flake or small pellet makes an excellent staple, and they relish small frozen and live foods — frozen bloodworms, daphnia, and brine shrimp will intensify their color and condition them for spawning. Feed small amounts once or twice a day, only what they finish in a couple of minutes. Their fast metabolism means they appreciate consistent, modest feedings.
Tankmates and Temperament
Bloodfins are peaceful but energetic, and their quick movements can occasionally fin-nip slow or long-finned tankmates, so avoid pairing them with bettas or fancy guppies. They do best with other active, similarly sized fish. Great companions include other tetras, danios, rasboras, peaceful barbs, rainbowfish, and bottom-dwelling corydoras catfish. A keeping a full school of Bloodfins also keeps their energy directed at each other rather than their tankmates. Peaceful freshwater shrimp can work with adults, though tiny shrimplets may occasionally be eaten.
For more tetra community ideas, see our black phantom tetra care guide and our Columbian tetra tankmates guide.
Is the Bloodfin tetra Right for You?
If you want a hardy, active, brightly finned schooling fish that tolerates a wide range of conditions, the Bloodfin tetra is one of the best beginner tetras around. It rewards a proper-sized school and a stable, cycled tank with constant motion and flashing red color. New to the hobby? Read our common beginner mistakes guide first, and if you are comparing schooling fish, our cardinal vs. neon tetra comparison is a helpful read.
Frequently Asked Questions
How many Bloodfin tetras should I keep together? Keep at least 6, and ideally 8 or more. They are schooling fish that are far calmer, bolder, and more colorful in a proper-sized group — a small school can become nippy and stressed.
Are Bloodfin tetras good for beginners? Yes. They are among the hardiest tetras, tolerate a wide pH and temperature range, and are very forgiving as long as the tank is cycled and stable. Their adaptability makes them a great first schooling fish.
Do Bloodfin tetras nip fins? They can. Their fast, playful nature occasionally leads to nipping slow or long-finned fish, so avoid bettas and fancy guppies. Keeping a full school and pairing them with other active fish prevents most issues.