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






