The Galaxy Rasbora (Danio margaritatus), more accurately known as the Celestial Pearl Danio (CPD), is a stunning nano fish that revolutionized the aquarium hobby upon its discovery in 2006. Native to high-altitude, shallow ponds in Myanmar, these "miniature trout" are beloved for their iridescent blue-black bodies covered in gold, star-like spots.
Quick Care Guide
Size: Very small, typically reaching only 0.8 to 1 inch (2–2.5 cm).
Temperament: Generally peaceful but shy. They feel most secure in groups of 6 or more; larger groups (10–15) reduce timidity and showcase natural behavior.
Tank Requirements: A minimum of 10 gallons is recommended. They thrive in heavily planted tanks with low water flow and plenty of hiding spots.
Water Parameters:
Temperature: 72–78°F (22–26°C). They can tolerate slightly cooler "unheated" indoor setups.
pH: 6.5–7.5. Stability is more critical than hitting a specific number.
Hardness: Soft to moderately hard (3–12 dGH).
Diet: Omnivorous. They accept crushed flakes and micro-pellets, but thrive on live or frozen foods like baby brine shrimp, daphnia, and moina.
