Family: Osphronemidae
Brunei Beauty — a Osphronemidae from Southeast Asia, mostly peaceful; slow, deliberate movers that dislike chaos. Reaches 4.5–6.6 cm; a pair bonds loosely; keep décor between rivals. 24–28 °C.
Betta macrostoma is a Osphronemidae from Southeast Asia. In the wild it prefers still waters, rice paddies and slow streams; in the aquarium it stays mostly peaceful. Plan on 4.5–6.6 cm of adult fish at 24–28 °C. Related profiles: Betta imbellis, Betta smaragdina, Betta splendens.
A moderate-level species: mostly peaceful; slow, deliberate movers that dislike chaos; stable water matters more than fancy equipment.
Hold 24–28 °C and keep it stable — 24.0–28.0 °C typical for the genus. Heater required; stable warmth.
Expect 4.5–6.6 cm as an adult, living upper; surface-oriented. A 52 L tank or larger gives it room.
Omnivore; flakes, small pellets and frozen foods. Vary the menu — quality flakes or pellets plus frozen or live foods.
Mostly peaceful; slow, deliberate movers that dislike chaos. Recommended tankmates: Other calm labyrinth fish — Share the slow lane. Avoid Fin-nippers like tiger barbs — Torn fins and endless stress.
Native to Southeast Asia, where it lives in 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.
Surface bubble-nester with dedicated male guarding. Males larger with longer fins.