This miniature cyprinid was first given the scientific name Celestichthys margaritatus, meaning “heavenly fish adorned with pearls”. The genus Celestichthys was created just for them. Over the next few years, they were reclassified as a Danio species and thus renamed Danio margaritatus (source). In the hobby, these fish are generally sold under the names Danio margaritatus, Celestichthys margaritatus, Celestial Pearl Danio, Microrasbora sp. ‘galaxy’, and Galaxy Rasbora.
The common name galaxy rasbora was popularized by those who brought the species to the hobby before it was scientifically classified. Because of its small size, it was thought to be a species of rasbora. They were later classified as a Danio species, but the common name stuck.
Celestial pearl danios are relatively easy to care for and don’t require excessively large tanks. A 10 gallon would work well for a smaller group of 6-10 fish. This makes them ideal for nano setups or for beginner keepers who are looking for something different. While they don’t require a highly specialized setup, they will do best in a planted tank.
Because they prefer to be kept in the low to mid 70s (Fahrenheit), these little stunners can be kept at room temperature and don’t require a heater. While they will tolerate temperatures as low as 65°F all the way up 80°F, I highly suggest keeping them in their preferred temperature range. If your house’s ambient temperature drops below 70°F, I recommend investing in a heater with an adjustable thermostat.
Galaxy rasbora setups require the same basic equipment all other setups do: a tank, lighting, filtration, substrate, décor, water change equipment and monitoring equipment. Because these fish come from ponds with thick vegetation, a planted setup is strongly recommended.
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