Scarlet Badis Care
Dario dario
The scarlet badis (Dario dario) is one of the smallest aquarium fish, best known for the red and iridescent blue pattern of males. Its tiny size does not make it automatically easy: it moves slowly, hunts minute prey and may be outcompeted by larger fish. Males also defend small territories. Choose a calm, carefully furnished aquarium with tiny foods, dense cover and attention to the sex ratio. This species is not an automatic fit for a busy community aquarium. Observe feeding closely after introduction and remove any tankmate combination that causes persistent stress or food loss.
Plan your aquarium →At a glance
- Temperature
- 18–26 °C
- pH
- 6.5–8.5
- GH
- 1–15 °dGH
- Aquarium length
- At least 45 cm
- Minimum aquarium volume
- At least 41 L
- Adult size
- Up to 2 cm
- Group size
- At least 2 individuals
- Temperament
- Territorial
About this species
Dario dario (Hamilton, 1822) belongs to Badidae. It occurs in tributaries of the Brahmaputra in parts of West Bengal and Assam, India; occurrence in Bhutan is possible but uncertain. The specialist profile describes seven iridescent blue vertical flank bars on males. Historical combinations include Badis dario and Labrus dario. Do not confuse scarlet badis with Badis badis.
Natural habitat
The species inhabits shallow, clear streams with sand or gravel and abundant marginal or aquatic vegetation. In an aquarium, a soft substrate, dense plant structure and gentle flow are appropriate. Wood, moss, floating plants and small shelters break sightlines and give fish places to retreat.
Aquarium and layout
Seriously Fish gives a minimum footprint of 45 × 30 cm and about 41 litres for a pair or one male with several females. The footprint helps distribute territories; a small volume alone does not prove that a tank is suitable. Use fine sand or gravel, plentiful cover and several separated small caves. Java moss or similar fine structure can provide shelter and spawning substrate. Use gentle filtration and leave part of the surface open.
Water conditions
The specialist aquarium profile gives 18–26 °C, pH 6.5–8.5 and 1–15 dGH. These are broad limits, so stability matters more than aiming for an extreme. Test the aquarium water and acclimate new fish gradually. Avoid abrupt changes in temperature or pH.
Behaviour and group size
The scarlet badis is a slow, retiring micropredator rather than a schooling fish. Larger or boisterous tankmates may intimidate it or take food first. Males defend small territories and may fight intensely in confined aquaria. In small tanks, a pair or one male with several females is more prudent; groups need extra space and separated cover. Treat tankmate choice as a careful assessment, not as a result of overlapping water values. Tiny prey animals are not safe.
Feeding
In nature, Dario eats small crustaceans, worms, insect larvae and other zooplankton. Offer tiny live or frozen foods such as Artemia nauplii, Daphnia, grindal worms or micro-worms. Check that each fish is eating; faster tankmates may take food first. Seriously Fish advises against bloodworm and Tubifex because of obesity and health concerns. Do not rely on dry foods if the fish are not accepting them.
Breeding
During reproduction the species forms temporary pairs and shows the characteristic badid spawning embrace. The male guards eggs and larvae. A calm, planted species aquarium with moss and fine cover is more suitable for fry than a busy community setup. Results are not guaranteed. Anyone raising fry should prepare a separate rearing option and very fine starter food.
Sources & review
This care guide draws on several specialist sources and was last checked on .