Blue badis
Badis badis
intermediate careOverview
The blue badis (Badis badis), or dwarf chameleon fish, is a small, secretive predator from the streams and ponds of South Asia. A confident male is a slow-burning jewel — his grey resting colours give way to deep electric-blue flanks barred with dark bands. Peaceful, deliberate and full of subtle behaviour, it is a rewarding fish for a quiet, planted, well-structured tank, though its refusal of dry food makes it a step above a beginner community fish.
Tank & water
A pair or small group thrives in a mature, planted 45-litre (12-gallon) tank or larger with plenty of cover.
- Temperature: 22–26 °C from a small heater; it tolerates the cooler end of tropical.
- Water: soft to neutral, pH 6.5–7.5, clean and stable. Test with a kit.
- Caves and structure: wood, rock crevices, leaf litter and dense planting give territories and spawning sites.
- Gentle flow: a soft filter suits this deliberate, slow-moving fish.
Feeding
Blue badis are micropredators that usually refuse dry food. The staple should be small live and frozen fare — bloodworm, daphnia, brine shrimp, cyclops and mosquito larvae. Feed deliberately and patiently; they stalk their food rather than dashing for it, so avoid greedy tankmates that snatch every meal. See how often should I feed my fish.
Behaviour & tankmates
Peaceful towards other species but easily out-competed, the blue badis suits a calm planted tank or a species setup. Good companions are small, gentle fish that share its water — small rasboras, ember tetras and peaceful corydoras. Avoid boisterous or fast feeders. Note that males may hunt tiny shrimplets, though adult shrimp are usually safe.
In a settled tank a pair will often spawn inside a cave, where the male tends and guards the eggs, giving patient keepers a chance to watch the full breeding cycle. A quiet, lightly stocked layout with several caves is the surest way to see this behaviour.
Give the blue badis a mature, planted tank with caves and a live-food diet, and its shifting electric-blue colours and cave-guarding behaviour make it one of the most engaging small oddballs in the hobby — see our best nano aquarium picks.
Blue badis — frequently asked questions
Why is it called the chameleon fish?
Because a male blue badis shifts colour dramatically with mood, from a dull grey-brown to a deep, glowing electric blue when he is confident or courting. This colour-changing ability, combined with a shy, deliberate manner, makes it one of the more captivating small fish for a quiet planted tank.
Will blue badis eat flake food?
Usually not. They are micropredators that tend to ignore dry flakes and pellets and hold out for live and frozen foods. Be ready to feed bloodworm, daphnia, brine shrimp and similar; a purely dry diet often leaves them thin and colourless.
Are blue badis good community fish?
They are peaceful but shy and slow-feeding, so they do best in a calm, gently stocked tank or a species setup rather than a busy community. Fast, greedy tankmates out-compete them for food, and males can be territorial around their chosen cave, so provide plenty of cover.
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