Description
Red Eye Tetra
📌 Basic Info
Scientific Name: Moenkhausia sanctaefilomenae
Common Names: Red Eye Tetra, Blood Eye Tetra
Family: Characidae (Tetra Family)
Order: Characiformes
Origin: South America — mainly Brazil, Paraguay, and Uruguay freshwater rivers
Size: Up to 2 inches (5 cm) in captivity
Lifespan: 3 – 5 years
Tank Zone: Mid-level swimmer
🌊 Water Parameters
TDS: 50 – 200 ppm
pH: 6.0 – 7.5
Temperature: 22 – 28°C (72 – 82°F)
Hardness: 5 – 15 dGH
🐟 Characteristics
Body: Small, elongated body with smooth scales.
Coloration: Silvery body with a bright red eye; fins mostly translucent.
Fins: Rounded dorsal, anal, and caudal fins; small pectoral fins.
Behavior: Peaceful, schooling fish; very social.
Nature: Active and mid-level swimmer; enjoys open swimming areas.
Special Feature: Red eyes are striking in well-lit aquariums and enhance overall beauty.
🍽️ Food
Type: Omnivorous
Diet: Flakes, micro-pellets, live/frozen foods such as daphnia, brine shrimp, and bloodworms.
Feeding Frequency: Once or twice daily.
Tip: Feed small amounts multiple times a day to maintain health and vibrant eye color.
🛠️ Maintenance
Tank Size: Minimum 60 liters (15 gallons) for a small school.
Filtration: Moderate filtration; gentle water flow preferred.
Substrate: Fine gravel or sand; smooth substrate recommended.
Decor: Plants, driftwood, and open swimming areas; floating plants are appreciated.
Lighting: Moderate; enhances red eye and body coloration.
Water Change: 20–25% weekly.
👥 Social Behavior
Group Size: Best kept in schools of 6 or more.
Tank Mates: Peaceful community fish like guppies, rasboras, other tetras, and small gouramis.
Avoid: Aggressive or fin-nipping species.
Compatibility Note: Very social; stress occurs if kept alone or in too small groups.
✅ Do’s
Keep in schools for best behavior and appearance.
Provide plants and open swimming areas.
Maintain clean water with regular changes.
Feed a varied diet including live and frozen foods.
❌ Don’ts
Don’t keep singly; they are schooling fish.
Don’t house with aggressive species.
Don’t neglect water quality; sensitive to ammonia/nitrite spikes.
⭐ Quick Tips
Red Eye Tetras are peaceful, vibrant, and schooling freshwater fish. Their silvery body and striking red eyes make them ideal for community tanks, adding color and activity to mid-water levels.




