Galaxy Rasbora (Celestichthys margaritatus)

The Galaxy Rasbora (Celestichthys margaritatus), also known as the Celestial Pearl Danio or CPD, is a dazzling nano fish scattered with pearly white spots over a deep blue body and finished with fiery red-orange fins. Only discovered in 2006 in the highland pools of Myanmar, it has quickly become one of the most beloved centerpiece fish for planted nano tanks. Care level is beginner to intermediate: it is hardy once settled but appreciates stable water and a calm, well-planted home. Pair it with the rest of our freshwater livestock.

Care Guide

• Tank size: 10 gallons or larger. A planted nano tank with gentle flow and plenty of cover shows off their color and keeps them confident.
• Keep in groups: A shoal of 6 or more, with 8 to 10 plus looking even better. In a group the males color up and display, and having females present spreads out their harmless sparring.
• Diet: Micro-omnivore with a tiny mouth. Feed small foods such as micro pellets, finely crushed flakes, and frozen or live baby brine shrimp, daphnia, and cyclops. Variety brings out their best color.
• Water quality: Temperature 73 to 79°F (they do well on the cooler side), pH 6.5 to 7.5, soft to moderately hard. They can be sensitive to poor water when freshly imported, so stay on top of maintenance.
• Temperament: Peaceful and a little shy. Keep them away from larger or boisterous fish that would outcompete or intimidate them.

Specifications

Compatibility

Galaxy Rasboras are perfect for a peaceful nano community. Their tiny size means they pair best with other small, gentle tankmates, and they will not bother adult dwarf shrimp.

• Panda Cory and other small corydoras
• Otocinclus Catfish
• Neocaridina (Cherry) Shrimp
• Nerite Snails

Avoid large or fin-nipping fish, anything big enough to see a Galaxy Rasbora as a snack.

Recommended Foods & Supplies

• Hikari Vibra Bites
• More fish foods
• Freshwater shrimp & snails
• More freshwater fish

FAQ

How many Galaxy Rasboras should I keep?
Keep at least 6, and 8 to 10 or more looks fantastic. Larger groups feel secure, color up faster, and show off their natural shoaling behavior.

Are they good for beginners?
Yes. Once settled they are hardy and easy. Give them stable, clean water and a planted tank, and avoid housing them with large or aggressive fish.

Will they bother my shrimp?
No. Galaxy Rasboras are safe with adult dwarf shrimp like neocaridina. They may snack on tiny shrimplets, but the two are commonly kept together.

What do I feed such a small fish?
Offer small foods their tiny mouths can manage: micro pellets, crushed flakes, and frozen or live baby brine shrimp, daphnia, and cyclops.