Known for their simplicity in coloration, often displaying shades of brown or olive with minimal patterns.
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Known for their simplicity in coloration, often displaying shades of brown or olive with minimal patterns.
Males have iridescent blue-green faces, gray-brown bodies, and red edges on fins. Females are less colorful and slightly smaller.
2-3 years
Carnivorous; prefers high-quality Betta pellets or flakes, supplemented with occasional live or frozen foods.
Betta simplex is an excellent introduction to wild mouthbrooding Bettas. It’s hardier than many wild types and displays subtle beauty and gentle temperament, making it ideal for planted and blackwater tanks.
Beginner to Intermediate
10 gallons for a pair; 20+ gallons for a group
6.5–7.5
5–12 dGH (soft to moderately hard)
72–80°F (22–27°C)
2.2 inches (5.5 cm)
Peaceful rasboras, small tetras, pygmy corydoras, and shrimp (with caution). Best in species-only or peaceful community tanks.
Avoid aggressive fish, fast-moving species, or fin-nippers. Avoid bright lighting and excessive flow.
Betta simplex
Osphronemidae
Krabi Province, Southern Thailand
Peaceful and social. Can be kept in pairs or small groups. Males are mildly territorial but rarely aggressive.
Live food like daphnia, mosquito larvae, and baby brine shrimp bring out their best health and color. They will accept high-quality pellets or flakes, but live foods should be prioritized during breeding.
Mouthbrooding species. Male holds eggs and fry in his mouth for around 10–14 days.
After a brief courtship, the female releases eggs, and the male collects them into his mouth. He incubates them for about 10–14 days, during which he does not eat. Once the fry are free-swimming, they can be removed or grown out with the parents in a low-flow tank.
Prefers clean, oxygen-rich water. Slightly acidic to neutral pH with moderate hardness. Use leaf litter, driftwood, and dim lighting to mimic natural habitat.
Sensitive to poor water conditions. Watch for velvet, fungal infections, and fin rot. Needs stable parameters and a stress-free tank.
Can be territorial and aggressive towards other male Betta fish. Best kept alone or in a species-specific setup.
Very peaceful, even during breeding. Males guard their territory but do not chase tankmates. They stay calm when kept with compatible species in well-planted tanks.
If you’re looking for a wild Betta species with a unique parenting method and peaceful nature, Betta simplex should be on your list. Its subtle coloration and mouthbrooding behavior offer a natural and enriching fishkeeping experience. With simple requirements and minimal aggression, it is ideal for beginner-to-intermediate aquarists interested in expanding beyond Betta splendens.