Serpae Tetra

The Serpae Tetra is a vibrant and eye-catching freshwater fish known for its bright red body and distinctive black “shoulder” spot just behind the gills. Its flowing fins, especially in males, add to its striking appearance. Native to South American river systems, this species is active and hardy, making it popular among aquarists—but it does have a slightly nippy temperament that requires careful tank mate selection.

Serpae Tetra (Hyphessobrycon eques) – Complete Care Guide Description The Serpae Tetra is a vibrant and eye-catching freshwater fish known for its bright red body and distinctive black “shoulder” spot just behind the gills. Its flowing fins, especially in males, add to its striking appearance. Native to South American river systems, this species is active and hardy, making it popular among aquarists—but it does have a slightly nippy temperament that requires careful tank mate selection. Water Parameters Adaptable but thrives best in stable conditions: Temperature: 24–28°C (75–82°F) pH: 5.5–7.5 Hardness: 2–15 dGH Tank Size: Minimum 60–80 liters (15–20 gallons) Water Flow: Gentle to moderate Water Changes: 20–30% weekly Care & Maintenance Serpae Tetras are relatively hardy with proper care: Keep in groups of at least 8–10 to reduce aggression and fin-nipping. Provide a planted aquarium with open swimming space. Maintain stable water conditions and good filtration. Use moderate lighting and darker substrate for better coloration. Feed a varied diet: flakes, micro pellets, and live/frozen foods (daphnia, bloodworms). Avoid overcrowding to minimize aggression. Behaviour & Temperament Semi-aggressive compared to other tetras. Known for fin-nipping, especially when kept in small groups. Active and energetic swimmers. Establish a pecking order within the group. Less aggressive when kept in larger schools. Compatibility Suitable for semi-aggressive community aquariums. Works best with active, similarly sized fish. Avoid slow-moving or long-finned species. Suitable Tank Mates Other robust tetras Barbs (non-aggressive types) Corydoras catfish Rainbowfish Loaches (active species) Tank Mates to Avoid Long-finned fish (Bettas, Angelfish) Very peaceful or slow-moving fish Small delicate species Aggressive fish that may escalate conflict Pro Tips Keep in larger groups (10+) to spread aggression. Provide plenty of plants and décor to break line of sight. Avoid mixing with long-finned ornamental fish. Feed regularly to reduce fin-nipping behavior. Maintain stable water conditions for best health. Monitor behavior—remove overly aggressive individuals if needed. Summary The Serpae Tetra is a bold, colorful, and active fish that adds energy to aquariums. While slightly aggressive, proper group size, tank setup, and careful selection of tank mates ensure they thrive and create a dynamic display in semi-aggressive community tanks.