A small, brilliantly colored labyrinth fish from South Asia, popular for nano and community tanks. Beautiful and peaceful, but commercial stock is widely affected by a serious viral disease, so source carefully.
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Small, about 2-3.5 in (5-9 cm); males slightly larger and brighter.
Lifespan
3–5 years
Social needs
pair
Native region
South Asia (India, Bangladesh, Pakistan), in the Ganges and Brahmaputra basins
Origin
Old World
Climate
🌴 Tropical
Water type
💧 Freshwater
Family
Osphronemidae
Genus
Trichogaster
Part of the Gouramis
Gouramis are labyrinth-breathing freshwater fish from Asia that gulp air at the surface, build bubble nests, and range from tiny croaking species to large centerpiece fish. Many are peaceful and characterful, thriving in warm, calm, planted aquariums.
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
Pair planted tank
15 gal / 57 L planted
Trichogaster lalius reaches 3.5 in. 15-gal planted tank for a pair (one male, one female; multiple males fight). Floating plants for bubble-nest building, gentle filtration, soft slightly acidic water.
Recommended
Planted community
20 gal / 76 L planted
20-gal planted community with one male, floating plants, peaceful tankmates, warm 24–28 °C. Source from reputable breeders — Iridovirus is rampant in commercial stock.
Cucumberkvp / Public domain (Wikimedia Commons)
Photo coming soon
Ideal
SE Asian biotope
29 gal+ / 110 L+ biotope
SE Asian biotope with floating plants, leaf litter, peaceful dither fish, and a bonded pair. Male builds bubble nests and tends fry — engaging breeding behaviour.
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.
Color & pattern variants
Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.
A single dwarf gourami needs at least a 10-gallon tank, with 15-20 gallons giving better stability and room; provide a long footprint rather than a tall, narrow tank. Plant heavily, add floating plants to dim the light and give cover, and keep flow gentle, as these fish dislike strong currents and surface turbulence.
Maintain 77-82°F (25-28°C), pH roughly 6.0-7.5, and soft to moderately hard water. As a labyrinth fish, the dwarf gourami breathes atmospheric air at the surface, so keep the lid in place but leave a warm, humid air gap above the water and never block surface access.
Substrate
Use a dark sand or fine gravel substrate to enhance their iridescent colors and complement a planted, blackwater-style scape. A soft bottom paired with leaf litter mimics their slow, vegetated natural habitat.
Equipment & setup
A 10-20 gallon tank with very gentle flow (sponge filter or baffled output) suits these labyrinth breathers, kept at 77-82F with floating plants to dim the lighting. They gulp air at the surface, so leave a warm, draft-free air gap above the waterline to protect their labyrinth organ.
Diet
Dwarf gouramis are omnivores. Feed a quality flake or micro-pellet as a staple plus frozen and live foods such as bloodworms, brine shrimp, and daphnia, and include some vegetable or spirulina-based food. They will also pick at small invertebrates and algae.
Feed small portions once or twice a day. A varied diet supports their color and overall resilience, which matters for a species already prone to health issues.
Behavior & temperament
Generally peaceful and somewhat shy, dwarf gouramis appreciate a calm community with plants and hiding spots. Males can be territorial toward one another and toward similar-looking fish, so house a single male, or a male with one or more females, rather than rival males in a small tank.
They are surface-oriented and curious, often hovering among floating plants. Males build bubble nests when in breeding condition. Tankmates should be peaceful and non-nippy, since long-finned, slow gouramis are easy targets.
Health
The defining concern is Dwarf Gourami Iridovirus (DGIV), a highly contagious and incurable viral disease widespread in farmed stock due to heavy inbreeding; infected fish waste away and usually die within weeks, and the virus can spread to tankmates. There is no treatment, so prevention through careful sourcing and strict quarantine is the only defense. A bacterial 'dwarf gourami disease' (often Mycobacterium-related) causes similar wasting and skin lesions.
Buy from reputable breeders or stores, quarantine every new fish, and avoid introducing fish from tanks showing sick or dying gouramis. Beyond viral disease, they are susceptible to ich, fin rot, and bacterial infections in poor water.
*This is general care information, not veterinary advice. Consult an aquatic/exotics veterinarian for any sick animal.*
Tips, DIY & hacks
Buy from healthy stock to avoid the widespread Dwarf Gourami Iridovirus and bacterial Dwarf Gourami Disease, which are untreatable; quarantine new fish strictly. Keep a single male or a male with several females, since two males will fight; floating plants and a calm tank bring out the boldest behavior and color.
