Family: Osphronemidae
Sumatra Betta — a Osphronemidae freshwater fish. Reaches 2.6–3.9 cm; keep at 24–28 °C.
Betta falx is a Osphronemidae. In the aquarium it stays territorial. Plan on 2.6–3.9 cm of adult fish at 24–28 °C. Related profiles: Betta imbellis, Betta smaragdina, Betta splendens.
Difficulty: moderate. Territorial; one male per tank. Solitary, pairs or small groups.
Hold 24–28 °C and keep it stable — 24.0–28.0 °C typical for the genus. Heater required; stable warmth.
Adults reach 2.6–3.9 cm; it is bottom-dwelling. Plan for at least 25 litres.
Carnivore; prepared foods plus frozen or live. It forages naturally over soft sand with leaf litter, so let some food reach the bottom.
Territorial; one male per tank. Recommended tankmates: Similar-sized peaceful community fish — Similar size and water needs. Avoid Much smaller fish — May outcompete or bully tiny tankmates.
Its habitat is still waters, rice paddies and slow streams — still to very gentle water, tolerates low oxygen; labyrinth breather.
It can jump when startled — keep the tank tightly covered, especially at night and during maintenance.
Bubble-nest builder with paternal care. Males larger with longer fins.