Red Eye Tetra Care Guide: Tank Setup, Diet & Tankmates for Beginners
If you're looking for a hardy, active schooling fish that brings constant motion to a community tank, the Red Eye Tetra is hard to beat. With its silvery body, bold black tail marking, and the bright crimson ring around each eye, it's a striking yet beginner-friendly choice. At Tropical Treasures Wyo in Cheyenne, it's one of our favorite recommendations for new aquarists who want personality without the fuss. Here's everything you need to keep Red Eye Tetras healthy and thriving.
Red Eye Tetra at a Glance
The Red Eye Tetra (Moenkhausia sanctaefilomenae) grows to about 2.5 to 3 inches and can live 3 to 5 years with good care. They're peaceful, social, and remarkably forgiving of beginner mistakes, which makes them one of the best beginner fish for freshwater aquariums. Like all tetras, they feel safest and show their best behavior in groups.
Tank Size & Schooling
Red Eye Tetras are active swimmers, so give them room to move. A minimum of 20 gallons is ideal, and because they're a schooling species, you should keep at least six together. A proper school reduces stress, curbs any fin-nipping tendencies, and brings out their natural shoaling display. The more you keep, the more relaxed and colorful they become.
Water Parameters & Heating
These tetras tolerate a wide range of conditions, which is part of their beginner appeal. Aim for a temperature of 73–82°F, a pH between 6.0 and 8.0, and soft-to-moderately-hard water. A reliable adjustable aquarium heater keeps temperatures stable, and you can browse more options in our aquarium heaters collection. Test your water regularly with an API Freshwater Master Test Kit to keep ammonia and nitrite at zero.
Filtration & Water Quality
A gentle, well-cycled filter keeps your tetras' water clean without creating a strong current they'd have to fight. Explore options in our aquarium filtration collection. Whenever you add fresh tap water during a water change, always treat it first with a dechlorinator like Seachem Prime to neutralize chlorine and chloramine. You can find more treatments in our water conditioner collection.
Diet & Feeding
Red Eye Tetras are easygoing omnivores that accept just about anything. A quality flake food such as Xtreme Community Flakes makes a great staple, and you can supplement with frozen or freeze-dried treats like bloodworms and brine shrimp for variety. Feed small amounts once or twice a day — only what they finish in a couple of minutes. Browse our full fish food collection for more options.
Aquascaping & Plants
While these tetras don't require a planted tank, they look stunning against live plants and appreciate the cover. A darker aquarium substrate makes their silver bodies and red eyes pop, and a few live aquatic plants give them shaded resting spots between bouts of energetic swimming.
Best Tankmates
Red Eye Tetras are peaceful but can be mildly nippy if kept in too-small a group, so a full school plus calm companions is the recipe for harmony. They pair beautifully with other peaceful community fish. Great choices include other tetras like the tiny Ember Tetra or the vivid Cardinal Tetra, along with corydoras catfish, rasboras, and peaceful livebearers. Avoid long-finned, slow tankmates like bettas or fancy guppies, which can become nip targets. See more schooling options in our tetras collection.
Behavior & Sexing
Expect lively, constant swimming in the middle of the tank, especially at feeding time. Males tend to be slimmer, while females are typically rounder, particularly when carrying eggs. Red Eye Tetras are egg-scatterers and will breed in captivity, but they readily eat their own eggs, so a dedicated breeding setup with fine plants or a spawning mop is needed if you want fry to survive.
Get Your Red Eye Tetras in Cheyenne
Buying locally means your fish skip the stress of long shipping and arrive at home already strong and acclimated to good water. At Tropical Treasures Wyo in Cheyenne, you can hand-pick a healthy school of Red Eye Tetras, grab your heater, food, and water conditioner in one trip, and get setup advice tailored to your tank from people who keep these fish themselves.
New to the hobby or building a community tank? Stop by our Cheyenne store — we're always happy to help you pick fish that will thrive together.