Family: Gasteropelecidae
Marbled hatchetfish — a Gasteropelecidae from South America, peaceful but shy in bare or bright tanks. Reaches 2.6–3.9 cm; shoaling; 8–10+ unlocks full colour and calm. 24–28 °C.
Carnegiella strigata, a member of the family Gasteropelecidae, comes from South America, where it inhabits warm freshwater streams and lakes. Peaceful but shy in bare or bright tanks and unfussy; a varied small diet preserves colour, it grows to 2.6–3.9 cm and adapts well to a properly set-up aquarium in the 24–28 °C range. In a community tank it pairs well with Other small peaceful tetras and rasboras.
A moderate-level species: peaceful but shy in bare or bright tanks; stable water matters more than fancy equipment.
Aim for 24–28 °C. Stable temperature matching the species origin; 24–28 °C recorded range.
Expect 2.6–3.9 cm as an adult, living middle of the water column. A 25 L tank or larger gives it room.
Unfussy; a varied small diet preserves colour. Feed two small meals a day rather than one large one.
Peaceful but shy in bare or bright tanks. Recommended tankmates: Other small peaceful tetras and rasboras — Form a mixed, calm mid-water mass. Avoid Single-species isolation — A lone tetra is a stressed tetra.
Comes from South America: warm freshwater streams and lakes. Expect still to gentle current and moderate oxygen levels.
Not a noted jumper — a standard cover still keeps dust and spray in.
In the aquarium: scatters eggs among plants; light-proof the setup or add mops. Subtle external differences.