Scientific Name: Celestichthys margarita (Synonym: Danio margaritatus)

Commonly known as the Celestial Pearl Danio (CPD) or Galaxy Rasbora, this is the crown jewel of the nano aquarium world. Reaching a tiny maximum size of just 0.8 to 1 inch (2-2.5 cm), they look like living miniature trout. Their deep midnight-blue bodies are covered in a galaxy of shimmering golden dots, topped off with fiery electric-orange and black stripes tracing their fins. They are peaceful, tightly schooling fish that prefer swimming in the mid-to-lower levels of the aquarium.

Temperature: 20°C - 26°C (68°F - 79°F). They thrive and feel much more active on the cooler side, ideally around 22°C - 24°C (71°F - 75°F).
pH: 6.5 - 7.5 (Neutral to slightly alkaline water signatures are preferred).
Hardness (GH): 5 - 15 dGH (Soft to moderately hard water).

Minimum Tank Size: Due to their minuscule size, a healthy colony can easily thrive in a nano tank of 10 gallons (approx. 35-40 liters). It is highly mandatory to keep them in schools of 6 to 10 individuals minimum. A larger group dramatically boosts their confidence, prevents shyness, and triggers males to engage in beautiful, non-harmful fin-flashing courtship displays.
Compatibility: The ultimate candidates for premium nano community tanks and high-end aquascapes. They coexist perfectly with other peaceful nano species (like Chili Rasboras, White Cloud Mountain Minnows, Otocinclus) and are an exceptional choice for dwarf shrimp (Neocaridina setups). While they might occasionally snack on a microscopic newborn shrimplet, their tiny mouths pose zero threat to juvenile or adult shrimp.
WARNING: Never house them with medium or large fish (such as Angelfish or large tetras), as they will be eaten instantly.

Omnivorous micro-predators. Because of their incredibly small mouths, standard dry foods must be crushed into fine micro-pellets or high-quality powder. To unlock their signature fiery coloration, it is highly recommended to supplement their diet with tiny live or frozen foods, such as Baby Brine Shrimp (Cysts), micro-worms, or small daphnia.

Pro Tip 1: Heavily Planted Layouts: CPDs can be quite shy if kept in barren tanks with high-intensity direct lighting. Emphasize in your product description that they require densely planted tanks with shady areas (aquatic mosses and floating plants like Salvinia or Red Root Floaters are perfect match-mates). When they know cover is nearby, they feel safe and spend the day showcasing themselves out in the open.
Pro Tip 2: Sexual Dimorphism: A great customer tip: males boast a much deeper blue coloration and fiery crimson fins. Females are noticeably rounder, present a slightly duller grayish-blue coat, and feature a very pale orange tint on their fins.
Pro Tip 3: Low-Turbulence Flow: They are not built to battle heavy river currents. They thrive best in environments with gentle to moderate water flow patterns (sponge filters or adjustable hang-on-back filters are highly recommended).

Rasbora Galaxy (Celestichthys Margarita)

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