The Buenos Aires Tetra (Hyphessobrycon anisitsi) is an energetic, robust freshwater fish known for its silver body, bright red fins, and active schooling behavior. It is a hardy species, making it ideal for beginners and community tanks.
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The Buenos Aires Tetra (Hyphessobrycon anisitsi) is an energetic, robust freshwater fish known for its silver body, bright red fins, and active schooling behavior. It is a hardy species, making it ideal for beginners and community tanks.
Silver body with a metallic sheen. Fins are bright red, with the dorsal and anal fins often edged in black. Adults grow up to 2.5 inches (6–7 cm).
5–8 years with proper care
Omnivorous — feeds on high-quality flakes, pellets, and enjoys live or frozen foods such as bloodworms, brine shrimp, daphnia, and micro-worms.
Buenos Aires Tetras are vibrant, energetic fish that add movement and color to community tanks. Proper schooling and compatible tank mates ensure peaceful cohabitation and minimize fin-nipping.
Easy — hardy and adaptable, suitable for beginner aquarists.
25 gallons (for a school of 6–10+)
6.5 to 7.5
5–20 dGH
72–79°F (22–26°C)
2.5 inches (6–7 cm)
Compatible with other peaceful or semi-aggressive tetras, rasboras, danios, corydoras, small livebearers, dwarf gouramis, and snails/shrimp.
Avoid slow-moving or long-finned fish like bettas, angelfish, and fancy guppies, as they may be fin-nipped.
Hyphessobrycon anisitsi
Characidae
Paraguay and southern Brazil, South America
Schooling fish. Best kept in groups of 6 or more to encourage natural behavior and reduce aggression.
Feed 2–3 times daily in small portions. Provide a mix of flakes or pellets and supplement with live/frozen foods for optimal color and health.
Egg scatterer. Spawns in fine-leaved plants or spawning mops. Adults should be removed post-spawning as they may consume eggs.
Requires a separate breeding tank with soft to moderately hard water (pH 6.5–7.5, temperature 75–79°F / 24–26°C). Provide fine-leaved plants or spawning mops. Eggs hatch in 24–36 hours, and fry become free-swimming in 3–5 days. Feed fry initially with infusoria, then transition to baby brine shrimp.
pH: 6.5–7.5, Temperature: 72–79°F (22–26°C), Hardness: 5–20 dGH, Ammonia/Nitrite: 0 ppm, Nitrate: <20 ppm.
Prone to ich, fin rot, and stress-related illnesses if water quality is poor or if schooling numbers are insufficient.
Semi-aggressive; best kept in schools to reduce fin-nipping
Active and fast swimmers, especially in schools. Semi-aggressive; schooling reduces fin-nipping tendencies. Occupies mid- to upper-level areas in the tank.
Native to Paraguay and southern Brazil, the Buenos Aires Tetra is admired for its hardiness, bright coloration, and active swimming. It is a robust species that tolerates a wide range of water conditions and adapts well to different tank setups. Best kept in schools of 6 or more, it thrives in community tanks but may nip fins if kept in small groups or with long-finned species. Its energetic swimming makes it a lively and visually engaging addition to any aquarium.