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Brunei Beauty
Betta macrostoma
Family: Osphronemidae
Betta macrostoma, the Brunei Beauty, is widely considered the most beautiful wild betta species — males display deep orange-red bodies, black-bordered fins, and a striking bicolour pattern. It is a large, powerful mouthbrooder endemic to cool, clear streams in Brunei and Sarawak and is critically endangered in the wild. Keeping it successfully demands expert-level water quality management, cool temperatures, and near-perfect breeding conditions.
Keeping this species
- diet
- Carnivore – large live/frozen foods: earthworms, large bloodworms, crickets
- breeding
- Paternal mouthbrooder; pair bonding required
- lifespan
- 5–8 years
- max size
- 11 cm (4.3 in)
- tank size
- 20 gallons minimum; species-only tank strongly recommended
- temperament
- Territorial; males fight; keep as single pair only
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Water it likes
- ph
- 4.5–6.5
- ammonia
- 0 ppm
- nitrate
- <5 ppm
- hardness
- 1–5 dGH
- temperature
- 68–77°F (20–25°C)