Red-Eye Tetra — Fish Profile
Moenkhausia sanctaefilomenae
Quick Specs
| Adult Size: | 2.75" |
| Temperament: | peaceful |
| Care Level: | beginner |
| Min Tank Size: | 20 gallons |
| Temperature: | 72-82°F |
| pH Range: | 6.0-7.5 |
| Diet: | omnivore |
| Origin: | South America (Paraguay, Brazil, Peru) |
| Lifespan: | 5-6 years |
Overview
Red-Eye Tetras are hardy, active schooling fish named for their distinctive red eye ring. They have a silver body with a large black spot at the base of the tail and a yellow-gold marking above it. They are one of the most adaptable tetra species and make excellent community fish. Keep in groups of 6+ to prevent fin-nipping behavior.
Care Guide for Red-Eye Tetra
Tank Setup
Red-Eye Tetra requires a minimum tank size of 20 gallons. Maintain water temperature between 72°F and 82°F, with a pH range of 6.0 to 7.5. A properly sized tank with adequate filtration and regular water changes is essential for long-term health. When housing Red-Eye Tetra with other species, always choose a tank size that accommodates the most demanding fish in the community.
Feeding
Red-Eye Tetra is a omnivore feeder. Provide a varied diet appropriate for omnivore species to ensure optimal health and coloration. Feed small portions 2–3 times daily, and remove uneaten food after a few minutes to maintain water quality.
Temperament & Compatibility
This species is classified as peaceful. Red-Eye Tetra reaches an adult size of 2.75 inches and has a care level of beginner. Always research compatibility before adding new fish to an established aquarium. Individual temperament can vary, so monitor new introductions closely for the first 48 hours.
Origin & Lifespan
Red-Eye Tetra originates from South America (Paraguay, Brazil, Peru) and has an expected lifespan of 5-6 years when kept in proper water conditions with appropriate tank mates and diet.
Compatible Tank Mates
🟢 Good Tank Mates
🟡 Caution Tank Mates
Compatibility Results for Red-Eye Tetra
All 69 compatibility checks involving Red-Eye Tetra:
Recommended for Red-Eye Tetra
Tetra Tetramin Tropical Flakes — $8.49Tropical flake food for schooling tetras
Expert Care Tips for Red-Eye Tetra
- Mid-size tank: Red-Eye Tetra needs 20+ gallons. Choose a tank at least 2× as long as the fish's adult size (2.75") for adequate swimming room.
- Warm-water species: Red-Eye Tetra prefers 72–82°F. Use a reliable submersible heater with a thermostat — avoid temperature swings above 2°F per day.
- Adaptable pH range: Red-Eye Tetra accepts pH 6.0–7.5. Most tap water falls within this range, but always test and acclimate slowly.
- Peaceful community fish: Red-Eye Tetra works well in community tanks. Still, avoid housing with fish large enough to eat them — a 2.75" fish is vulnerable to anything with a mouth bigger than 2×.
- Acclimation: Always drip-acclimate Red-Eye Tetra over 30–45 minutes. Match temperature and pH gradually to prevent osmotic shock.