Max Size: up to 2.5 cm

Celestial Pearl Danio (Danio margaritatus)

The vibrant colours and peaceful nature of the Galaxy Rasbora make them extremely popular.

This fish has an unusual body shape compared to other fish of the same species.

There is a notable difference in the colours of the males and females. The males exhibit rather bright blue body colouration with more colouration in their fins, where females exhibit duller bluish-greenish background colouration with a tint of yellowish colour to their bellies. Both the male and the female body present small pearly dots.

Quick Facts
Scientific NameDanio margaritatus
Other NamesGalaxy rasbora, Fireworks rasbora, Rasbora toei, Chilli rasbora, Microrasbora
Aquarium LevelMiddle - Top
DifficultyBeginner - Intermediate
Best kept asGroups 6+
Lifespan3 - 5 years
Water Parameters
Water TypeFreshwater
Temperature68 - 78 ℉ (20 - 25.6 ℃)
PH6 .5 - 7.5
GH3 - 15
KH1 - 5
TDS100 - 500
Celestial Pearl Danios
Celestial Pearl Danio
Celestial Pearl Danio
Celestial Pearl Danio
Celestial Pearl Danio
Celestial Pearl Danio
Celestial Pearl Danio


Celestial Pearl Danios live among dense vegetation in marsh areas fed by springs or in small ponds of cool high altitude wetland regions in South East Asia. The water needs to be slightly alkaline, and the temperature shouldn't be to warm.

To date, they have come across this species in a small mountainous area near Hopong East of Inle Lake in the outskirts of the Shan state capital of Taunggyi and the Southeast Asian nation of Burma

Other Danios of interest

Bengal Danio(Devario devario)
Emerald Dwarf Danio(Danio erythromicron)
Fireline Danio(Devario sondhii)
Giant Danio(Devario aequipinnatus)
Glowlight Danio(Celestichthys choprae)
Lake Inle Danio(Devario auropurpureus, Inlecypris auropurpurea, Barilius auropurpureus)
View All Danios

Diet & Feeding

The Galaxy Rasbora has a tiny mouth, so you need to take into account the size of the food.

This species is not choosy eaters and will happily eat high-quality commercial dry flakes, pellets and granules, but as they tend to stay in the bottom and mid-levels, sinking pellets would be more appropriate.

This species will also eat small live or frozen foods such as brine shrimp, bloodworm, daphnia and cultured white worms which will keep their colours vibrant.

If these foods aren't readily available, they will happily eat algae and plants.

Sexual Dimorphism

It is quite easy to differentiate a male and female Rasbora. The males are thinner and often more vibrant in colour, with a more orangy chest and the tail end of their bodies tend to be higher, whereas females are slightly duller and have a more rounded body shape.


Galaxy Rasboras are known to scatter eggs when it is time for breeding then the male will swim over the eggs to fertilize.

unlike most fish species they do not seem to have spawning seasons

it is best to have soft water with minimal lighting.

The female will hide away her eggs in vegetation as a loose batch and will not lay too many eggs at once around 30 at a time. It is a process that may take a few hours with the male repeating the same thing over.

Once you are sure that the spawning and fertilization are complete, make sure you remove the adult fish from the tank because where possible the adults will eat the hatching fry.

Frquently asked questions about the Celestial Pearl Danio

Are Celestial Pearl Danios a shoaling fish?

Contradictory to popular belief, Celestial Pearl Danios are not actual shoaling fish. While they enjoy spending time with each other, they also like to separate themselves from the rest and do their own thing. Thus, they tend to live independently once they get settled in their environment.

How big do Celestal Pearl Danios get?

Celestial Pearl Danios average out at about 2.5 cm in length once they are fully grown, which is typically around three months of age when they reach sexual maturity.

How long do Celestial Pearl Danios live?

With the correct conditions, Celestial Pearl Danios can live for around 3 to 5 years in captivity. However, there are several things that may affect their lifespan, poor water conditions and stress being the biggest.

What are the best tankmates for Celestial Pearl Danios

Celestial Pearl Danios do best with the same species of fish. However, suppose you want to house them with other fish species. In that case, suitable tankmates could include non-aggressive, similarly sized fish with the same temperament, such as Neon Tetras, Guppies, Endlers and Dwarf Gouramis. You can also house Celestial Pearl Danios with Shrimp and snails.

What should you feed Celestial Pearl Danios?

Celestial Pearl Danios are not fussy eaters, and their diets can vary significantly. In their natural habitat, these Danios will usually feed off algae, plants, plankton and small vertebrae as a source of protein.

In captivity, the fish will readily accept High quality commercially available flakes, granules or pellets; however, make sure they are of a suitable size as they have very tiny mouths. In addition to dried food, you should supplement their diets with live protein-rich food such as krill, daphnia, brine shrimp and grindal worms; these are are all excellent choices.

What size aquarium do you need for Celestial Pearl Danios?

The ideal aquarium size for Celestial Pearl Danios is 45 litres if you keep six or more individuals together. However, just because you can keep these fish in smaller tanks does not mean they will not welcome more room. If you have enough space and don't mind paying for a slightly bigger aquarium, it will improve their quality of life.

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Date Added: 20/05/2020 - Updated: 14/07/2021 13:01:35