Galaxy Rasbora

The Galaxy Rasbora, also known as the Celestial Pearl Danio, is a tiny but incredibly striking freshwater fish admired for its deep blue body covered in pearl-like white spots and bright red or orange fins. Despite its small size, it is one of the most visually stunning nano fish in the aquarium hobby. Its shimmering galaxy-like appearance makes it a favorite for planted nano tanks and aquascapes.  

Galaxy Rasbora (Danio margaritatus) Description The Galaxy Rasbora, also known as the Celestial Pearl Danio, is a tiny but incredibly striking freshwater fish admired for its deep blue body covered in pearl-like white spots and bright red or orange fins. Despite its small size, it is one of the most visually stunning nano fish in the aquarium hobby. Its shimmering galaxy-like appearance makes it a favorite for planted nano tanks and aquascapes. Water Parameters Temperature: 20°C – 26°C pH: 6.5 – 7.5 Hardness: 2 – 10 dGH (soft to moderately soft water preferred) Ammonia/Nitrite: 0 ppm Nitrate: Below 15–20 ppm They thrive best in stable, clean, and well-oxygenated water. Care & Maintenance Galaxy Rasboras are hardy but sensitive to poor conditions: Minimum 40–60 liters tank (larger preferred for groups) Keep in schools of at least 8–12 fish for natural behavior Use gentle filtration with low flow Perform 20–25% weekly water changes Provide heavily planted aquariums with hiding spaces and dim lighting A mature, stable tank is essential for their long-term health. Behaviour & Temperament Peaceful and shy Schooling fish, more confident in groups Males may display mild territorial behavior during breeding Occupy mid to lower water levels In large groups, they display more active and natural behavior. Compatibility Ideal for peaceful nano community aquariums with similarly sized, non-aggressive fish. Suitable Tank Mates Chili Rasbora Ember Tetra Pygmy Corydoras Otocinclus Catfish Small peaceful shrimp (Cherry Shrimp) Small snails (Nerite, Mystery Snails) Tank mates should be small and non-aggressive. Tank Mates to Avoid Large or aggressive fish (Cichlids) Fast, boisterous species (large Barbs, larger Danios) Predatory fish Any fish large enough to eat them Due to their tiny size, they are highly vulnerable. Pro Tips Keep in larger schools to reduce shyness and improve coloration Use dark substrate and floating plants to enhance colors Feed micro foods like baby brine shrimp, daphnia, and crushed flakes Maintain very stable water conditions to avoid stress Avoid sudden changes in temperature or pH Provide plenty of cover to mimic natural habitat The Galaxy Rasbora is a breathtaking nano fish that brings sparkle and movement to planted aquariums. With proper care and a peaceful environment, it creates a stunning galaxy-like display in any aquascape setup.