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The Celestial Pearl Danio (Danio margaritatus), also known as the Galaxy Rasbora, is a small, strikingly beautiful freshwater fish native to Southeast Asia. This species was first discovered in 2006 in small, vegetated ponds in Myanmar and has since captivated the hearts of aquarists worldwide. The Celestial Pearl Danio typically reaches a maximum size of 2 to 2.5 centimeters in length, making it a perfect inhabitant for nano and planted aquariums.

One of the most remarkable features of the Celestial Pearl Danio is its vibrant coloration and patterning. The body of this tiny fish is a deep, iridescent blue, adorned with a constellation of pearly white spots that give the species its celestial name. The intensity of the blue hue can vary depending on the fish's environment and condition. Adding to its allure, the fins are often edged in a striking red or orange color, providing a sharp contrast to the cooler tones of the body. The males of the species are typically more brightly colored and slightly smaller than the females, who are fuller-bodied, especially when gravid.

The Celestial Pearl Danio thrives in well-planted tanks that mimic its natural habitat, with plenty of hiding spots and a gentle flow. They prefer cooler water temperatures ranging from 20°C to 25°C (68°F to 77°F) and a slightly acidic to neutral pH. Despite their peaceful nature, these fish are best kept in schools of six or more to encourage natural behavior and minimize stress. Observing a group of Celestial Pearl Danios darting through lush aquatic vegetation is a truly enchanting sight.

In terms of diet, the Celestial Pearl Danio is not particularly demanding. In the wild, their diet consists mainly of small invertebrates and zooplankton. In the aquarium, they will readily accept a variety of foods, including high-quality flake food, micro pellets, and frozen or live foods such as daphnia and brine shrimp. Providing a varied diet ensures optimal health and coloration.

Breeding Celestial Pearl Danios can be a rewarding experience. They are egg scatterers, laying their eggs among fine-leaved plants. The parents do not exhibit any form of parental care and may even consume their eggs or fry if given the chance. Therefore, breeding them in a separate, species-specific tank or using a spawning mop to collect eggs can help increase the survival rate of the offspring.

Despite its initial overharvesting due to high demand and limited supply, responsible captive breeding programs have made the Celestial Pearl Danio widely available and helped alleviate pressure on wild populations. Today, it remains a popular choice among aquarists, both novice and experienced, for its mesmerizing appearance and relatively easy care.

The Celestial Pearl Danio's discovery is a testament to the hidden wonders of the natural world, and its presence in the aquarium hobby serves as a reminder of the importance of conservation and sustainable practices. This diminutive fish, with its starry night sky pattern and peaceful demeanor, adds a touch of celestial beauty to any freshwater aquarium.