Galaxy Rasbora

Galaxy Rasbora, scientifically known as Danio margaritatus and also popular as Celestial Pearl Danio, is one of the most eye-catching nano freshwater fish for planted aquariums. Its dark body is covered with tiny pearl-like spots that resemble stars, while the fins often show attractive orange to red highlights. Because of its small adult size and peaceful nature, this fish is a favourite for aquarists building elegant nano tanks and calm community setups.

This species does best when kept in a proper group, where its natural colour and confidence become much more visible. In a well-maintained planted aquarium with gentle flow, dark substrate, and hiding spaces, Galaxy Rasboras display excellent contrast and active but non-aggressive behaviour. They are best suited for hobbyists who enjoy smaller fish with fine detail rather than large, bold specimens.

Key Features

• Appearance: Deep bluish to dark body with bright pearl-like white spots and colourful fins, giving it a celestial or galaxy-style pattern.
• Size: A true nano fish that usually grows to around 2 to 2.5 cm, making it suitable for compact aquariums when kept in groups.
• Colors: Speckled body pattern with orange, red, and sometimes black accents on the fins, especially in healthy, settled specimens.
• Lifespan: With stable water quality, proper feeding, and low stress, they can live for around 3 to 5 years.
• Temperament: Peaceful and shy at first, but more active and visible when maintained in a school with plenty of plant cover.
• Water Type: Freshwater fish best suited to clean, stable, well-filtered aquariums.

Care Requirements

• Tank Size: A tank of at least 30 litres is recommended for a small group, though larger planted tanks offer better stability and more natural behaviour.
• Water Parameters: Ideal temperature is around 22 to 26°C with a pH of roughly 6.5 to 7.5. Stability is more important than chasing exact numbers.
• Diet: Feed a varied diet of fine micro pellets, crushed flakes, and occasional small live or frozen foods such as daphnia, baby brine shrimp, or microworms.
• Tank Mates: Best kept with other peaceful nano species such as small rasboras, ember tetras, pygmy corydoras, and gentle shrimp-compatible community fish.
• Schooling Need: Keep them in groups of at least 6, though 8 to 12 or more is even better for confidence, activity, and natural social behaviour.
• Care Tips: Dense plants, moss, driftwood, and low-stress surroundings help bring out their best colour. Avoid housing them with large, aggressive, or overly fast feeders.

Galaxy Rasboras are an excellent choice for aquarists who want a premium-looking nano fish with peaceful behaviour and beautiful patterning. For best results, introduce them into a mature aquarium with gentle filtration, stable water, and plenty of visual cover so they settle quickly and show their full beauty.