Coffee Bean Tetra

Hyphessobrycon takasei, the Coffee Bean Tetra, is a small and subtly beautiful characid from the blackwater streams of the Amazon basin in Brazil. Its common name references the distinctive dark, oval humeral spot on the shoulder — resembling a coffee bean — set against a translucent pale body with a faint rosy or yellowish cast. While not as flashy as some of its relatives, the Coffee Bean Tetra possesses a quiet elegance that appeals to aquarists who favor natural, biotope-style setups. This species is less commonly available in the trade, making it a sought-after find among tetra enthusiasts. It inhabits soft, acidic, heavily shaded blackwater environments and is more parameter-sensitive than hardier tetras, requiring stable soft acidic conditions for long-term health and natural behavior. In too-hard or too-alkaline water, color fades and the fish becomes prone to stress-related illness. The Coffee Bean Tetra is entirely peaceful and timid, being easily outcompeted by more assertive tankmates. It is best housed with similarly small, calm species and should be kept in schools of 8 or more to increase confidence. Its intermediate difficulty rating reflects its specific water chemistry requirements rather than temperament or feeding challenges.

Tank Setup A 40-liter aquarium is adequate for a school given its small size. Create a dense blackwater setup with dark substrate, Indian almond leaves, driftwood, and fine-leafed plants like Java moss or Hydrocotyle. Dim lighting enhances the fish's coloring and reduces stress. Avoid bright, open layouts that intimidate this shy species.

Water Parameters Maintain pH 5.5–7.0, temperature 22–27°C, and soft water below 8 GH. This species is more sensitive to poor water quality and incorrect chemistry than common beginner tetras. Use RO water blended with remineralized water, or add peat to soften tap water. Perform 20% weekly water changes carefully.

Filtration A mature sponge filter or very gentle canister with diffused flow is ideal. Avoid any water movement that disturbs the fish or disrupts the natural leaf litter on the substrate. Biological filtration must be well-established before introducing this species.

Diet Feed micro-pellets, crushed flake, baby brine shrimp, micro-worms, and daphnia. Tiny mouth size requires very fine foods. Varied diet encourages good health in this species. Feed twice daily in minimal amounts to avoid fouling the substrate.

Tankmates Keep only with very small, gentle species: other small Hyphessobrycon tetras, pencilfish, dwarf corydoras, or microrasboras. Avoid any species that might outcompete it for food or cause stress through boisterous behavior.

Breeding Breeds in soft, acidic water with dim lighting and fine-leafed plants. Conditioning with live foods encourages spawning. Very small eggs are scattered and left unguarded; parents must be removed immediately. Fry require infusoria as first food before transitioning to baby brine shrimp.