Galaxy Rasbora (Celestichthys margaritatus), also known as the Celestial Pearl Danio, is a tiny and peaceful freshwater fish with iridescent spots and vibrant coloration, making it a favorite for nano aquariums and planted tanks.
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Galaxy Rasbora (Celestichthys margaritatus), also known as the Celestial Pearl Danio, is a tiny and peaceful freshwater fish with iridescent spots and vibrant coloration, making it a favorite for nano aquariums and planted tanks.
Small, laterally compressed body covered with iridescent blue or silver spots resembling stars on a dark body. Fins are orange-red with subtle blue edging. Males are more brightly colored with more pronounced spots; females are slightly paler and rounder.
2–4 years with proper care
Omnivorous; feeds on high-quality micro flakes, micro pellets, frozen foods, and live foods such as daphnia, microworms, and baby brine shrimp. Occasional finely chopped or blanched vegetables can supplement nutrition.
Galaxy Rasboras are ideal for aquarists seeking a tiny, peaceful, and visually stunning schooling fish. Perfect for nano tanks and planted aquariums, they bring vibrant colors and dynamic movement.
Intermediate – requires stable water, schooling, and high-quality nutrition.
10+ gallons (for a small school)
6.5 to 7.5
2–10 dGH
72–78°F (22–26°C)
0.8–1 inch
Other nano fish such as small tetras, dwarf rasboras, small danios, small peaceful rasboras. Avoid large, aggressive, or fast fish.
Large, aggressive, or fast species that may outcompete or stress them. Avoid fin-nippers.
Celestichthys margaritatus
Cyprinidae
Myanmar – small, vegetated ponds and shallow waters with dense plant cover.
Highly social; best kept in schools of 8–12 or more. Peaceful and compatible with other small, gentle community fish.
Feed 2–3 times daily with micro flakes, micro pellets, frozen/live foods. Ensure particle size is small enough for their tiny mouths.
Egg-scatterer; deposits eggs among fine-leaved plants or spawning mops. Adults do not guard eggs. Condition males and females with protein-rich live foods before spawning. Fry feed on infusoria and newly hatched brine shrimp.
pH: 6.5–7.5, Temperature: 72–78°F (22–26°C), Hardness: 2–10 dGH, Ammonia/Nitrite: 0 ppm, Nitrate: <10 ppm
Sensitive to water quality; prone to stress, ich, and bacterial infections if conditions fluctuate. Maintain clean water and stable parameters.
Extremely peaceful and social. Best kept in schools of at least 8–12 individuals. Compatible with other small, non-aggressive species. Active swimmers that enjoy planted tanks with hiding spots.
Native to small, vegetated ponds in Myanmar, Galaxy Rasboras are tiny, reaching only about 0.8–1 inch. They thrive in well-planted nano aquariums with gentle water flow, stable parameters, and clean water. Ideal for beginner to intermediate aquarists, they are visually stunning, peaceful, and highlight intricate aquarium setups.