Species description

Care, breeding and tankmates

Fish profile

Temperament

Peaceful

They are entirely peaceful toward other species but can be quite timid if not provided with enough cover or a large enough school. Intraspecific aggression is common among males, who constantly flare their fins and engage in tight, circling 'dances' to establish a pecking order, though actual injury is rare.

Diet

Omnivore

They are micro-predators that naturally feed on zooplankton and tiny invertebrates. In the aquarium, they require small-sized foods such as crushed high-quality flakes, specialized micro-pellets, and powdered fry food. Live or frozen micro-foods like daphnia, microworms, and newly hatched brine shrimp are highly recommended for optimal health and color.

Life expectancy

3-5 years

3-5 years.

Sex ratio

Specific M:F ratio

Males are deeply colored with a bright blue body, pearly spots, and intensely red fins, while females are duller, slightly plumper, and have transparent patches on their fins. Males frequently spar to establish dominance, so keeping a ratio of two females to every male helps reduce stress. A group of at least 8 to 10 is mandatory.

Feeding frequency

Twice daily

Because of their small digestive tracts, they should be fed tiny amounts of food twice a day. They are careful, sometimes hesitant feeders that prefer to pick food out of the middle of the water column as it slowly sinks. Care must be taken to ensure food reaches them if they are hiding among the plants.

Bioload

Low

The Celestial Pearl Danio produces a negligible bioload due to its tiny size, making it an excellent candidate for nano tanks. However, because they are somewhat sensitive to water quality fluctuations, the aquarium must still have a fully cycled and mature filtration system. Routine, small water changes are essential to keep nitrates low.

Flow

Moderate

They originate from shallow, densely vegetated ponds and slow-moving streams in Myanmar. They strongly prefer gentle, sluggish water flow in the aquarium; strong currents will quickly exhaust and stress them. A sponge filter or a baffled hang-on-back filter provides the perfect amount of gentle circulation.

Jump risk

Yes

Like many small cyprinids, they possess a moderate jump risk when startled. Sudden changes in lighting, vibrations, or being chased by a dominant male can cause them to dart upwards. A tight-fitting lid or a thick cover of floating plants is recommended to prevent accidental escapes.

Reproduction

Egg scatterer

They are continuous egg scatterers that are relatively easy to breed in a dedicated setup. Females will lay a few non-adhesive eggs daily among dense vegetation like Java moss. The parents are prone to eating the eggs and fry, so separating the adults from the spawning site after a few days is necessary.

Compatibility & tankmates

Peaceful

They are extremely peaceful but highly timid micro-fish that should only be kept with similarly sized, docile species. Aggressive or fast-moving fish will easily outcompete them for food and force them into hiding. Ideal tank mates include dwarf shrimp, pygmy corydoras, and other small rasboras or tetras.

Tank level

Middle

They predominantly occupy the lower and middle levels of the aquarium, rarely coming to the absolute surface. They are inherently shy and require a densely planted tank with plenty of hiding spots to feel secure. When comfortable, males will confidently display in the open spaces between plants.