The Galaxy Rasbora Galaxy Rasbora, scientifically known as Danio margaritatus, is a striking nano fish prized by aquarists for its deep blue body covered in pearlescent spots that resemble a starry night sky. Although commonly called a "rasbora," it was reclassified in 2008 into the Danio genus and is also frequently referred to as the Celestial Pearl Danio(CPD). Key Characteristics Appearance: Features a metallic blue-to-gray body with irregular rows of shimmer spots and fiery red-orange fins with black banding. Size: These are true nano fish, typically reaching a maximum length of about 0.75 to 1 inch (2–2.5 cm). Lifespan: With proper care, they generally live for 3 to 5 years. Behavior: They are peaceful but shy, schooling fish that feel most secure in groups of 6 to 10 or more. Aquarium Care Requirements Tank Size: A minimum of 10 gallons is recommended for a small group, though 15–20 gallons allows for more natural behavior. Setup: They thrive in heavily planted environments with mosses, floating plants, and dark substrate to enhance their colors and provide security. Water Parameters: Temperature: Prefer slightly cooler tropical waters, between 68°F and 78°F (20–26°C). pH: Maintain between 6.5 and 7.5. Hardness: Soft to moderately hard water (5–12 dGH). Diet and Compatibility Diet: Omnivorous micro-predators. They accept high-quality micro-pellets, crushed flakes, and live or frozen treats like baby brine shrimp, daphnia, and cyclops. Tank Mates: Best kept with other peaceful nano species such as Chili Rasboras, Ember Tetras, and freshwater shrimp like Cherry Shrimp. Avoid large or aggressive fish that might view them as prey.
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