A wild Southeast Asian relative of the Siamese fighting fish, the peaceful betta is far more tolerant of its own kind, often kept in pairs or small colonies. Its subtle iridescent green-blue sheen and red-edged tail reward keepers of soft, warm, well-covered tanks.
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Shallow forest streams, swamps, and rice paddies of peninsular Thailand, Malaysia, and Indonesia
Origin
Old World
Climate
🌴 Tropical
Water type
💧 Freshwater
Family
Osphronemidae
Genus
Betta
Part of the Bettas
Bettas are labyrinth-breathing freshwater fish from Southeast Asia, ranging from the famously aggressive domestic Siamese fighting fish to many subtle, peaceful wild species. They favor warm, soft, calm, well-covered tanks and are renowned for bubble-nest spawning.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Planted blackwater nano
10 gal / 38 L planted
Betta imbellis is far less aggressive than splendens — pairs and even small groups can coexist with cover. Soft acidic water (pH 6.0–7.0, 24–27 °C), tight lid, gentle flow.
Photo coming soon
Recommended
Pair / sorority blackwater
20 gal long / 75 L blackwater
Pair or trio in a heavily planted blackwater tank with leaf litter, driftwood, and floating plants. Bubble-nest builders — a peaceful tank shows natural courtship.
Photo coming soon
Ideal
Biotope with shrimp
29 gal+ / 110 L+ biotope
Long blackwater biotope with neocaridina shrimp, snails, and abundant plant cover. Pair raises fry naturally in stable tannin-rich water.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Egg
Fish eggs are small, translucent spheres, often laid in clutches on plants, substrate, or in a nest — or carried/brooded by a parent in livebearing and mouth-brooding species. A dark eye spot and the curled embryo become visible inside as development progresses.
Photo coming soon
Fry
Newly hatched fry are tiny and semi-transparent, frequently still carrying a yolk sac that fuels them before they feed freely. They lack full fin structure and adult coloration, staying near cover until they can swim and forage on their own.
Photo coming soon
Juvenile
Juveniles look like miniature adults but with developing fins and muted or different markings; many species shift pattern and color as they mature. Growth is rapid at this stage given clean water and steady feeding.
Adult
Adults show the species' full size, finnage, and mature coloration, and are sexually mature. Many fish develop sex-specific differences in size, color, or fin shape, which can intensify during breeding.
Habitat & enclosure
A planted tank of 40 L (10 gal) or more allows a pair or small group to establish space. As a labyrinth breather it needs surface access and a warm, humid air layer under a tight lid; it is also a notable jumper, so a gap-free cover is essential. Provide dense planting, floating plants, leaf litter, and gentle flow. Maintain 24-28 C (75-82 F), pH 5.5-7.0, and soft water. Tannin-stained blackwater conditions strongly suit this species.
Substrate
Fine dark sand or gravel suits them and enhances their iridescence. A generous layer of leaf litter (catappa/Indian almond) and botanicals lowers pH, releases beneficial tannins, supports microfauna, and provides spawning and hiding sites that mimic their forest-stream habitat.
Equipment & setup
A gentle sponge filter keeps the surface calm for labyrinth breathing and bubble-nesting. A heater maintains warmth, and a tight lid preserves humid surface air and prevents jumping. Subdued lighting filtered by floating plants is ideal. No UVB or strong current is needed.
Diet
A micropredator that prefers small live and frozen foods: bloodworm, Daphnia, brine shrimp, mosquito larvae, and Grindal worms. Many wild-type bettas accept good-quality micro-pellets and flake, but live and frozen items produce the best color and condition. Feed small amounts once or twice daily and avoid overfeeding.
Behavior & temperament
Much less aggressive than the domestic Betta splendens; males show off iridescent flaring during disputes but typically coexist in pairs or colonies in a large, well-planted, broken-up tank. Still, monitor for bullying and provide plenty of cover and sightline breaks. They are shy with boisterous tankmates and best in a species or calm community setup. A display fish, not handled.
Health
Hardy when kept in soft, warm, stable, tannin-rich water, but sensitive to hard, alkaline, or cold conditions. As a labyrinth breather, avoid a chilled air layer at the surface. Susceptible to fin and bacterial issues with poor water quality. Quarantine new and wild-imported stock to limit parasites and disease.
Tips, DIY & hacks
Keep as a bonded pair or in a colony within a spacious, heavily planted tank to spread aggression. They are bubble-nesters; the male builds and tends the nest, often among floating plants. Soft, acidic, tannin-stained water improves color and breeding. Avoid housing wild Betta imbellis with aggressive domestic bettas, which will outcompete and harass them.
