Micro Rasbora Galaxy

The Micro Rasbora Galaxy, scientifically named Danio margaritatus, is a tiny but captivating freshwater fish species that has captured the hearts of aquarium enthusiasts around the world. Renowned for its diminutive size, stunning appearance, and peaceful demeanor, this species has quickly risen to popularity among both novice and experienced aquarists. In this comprehensive guide, we will embark on a journey through the captivating world of the Micro Rasbora Galaxy, exploring its size, appearance, natural habitat, behavior, dietary preferences, and expert insights on successfully keeping these tiny wonders in your home aquarium.


The Micro Rasbora Galaxy is indeed “micro”, typically reaching an adult size of only 1.5 centimeters (0.6 inches). Its diminutive stature is offset by its mesmerizing beauty. These tiny fish feature a striking iridescent blue-green body adorned with a horizontal black stripe that extends from the nose to the base of the tail fin. This contrasting coloration is accentuated by a splash of bright orange or red near the caudal fin, making them a true gem in the aquarium world.


Native to the pristine waters of Southeast Asia, specifically in regions of Burma (Myanmar) and Thailand, the Micro Rasbora Galaxy is commonly found in slow-moving streams and shallow, densely vegetated ponds. These habitats are often shaded by overhanging vegetation, which provides shelter and a soothing ambiance for these delicate fish.


Despite their tiny size, Micro Rasbora Galaxies are active and social creatures. They prefer to live in groups, and their small size allows them to explore even the tiniest nooks and crannies of an aquarium. They are known for their peaceful demeanor, making them excellent candidates for community tanks with other small, non-aggressive species.


In their natural habitat, Micro Rasbora Galaxies feed on small aquatic insects, zooplankton, and algae. In a home aquarium, they accept a varied diet consisting of high-quality micro-pellets, crushed flakes, and live or frozen foods such as daphnia, baby brine shrimp, and micro worms. Their small mouths and appetites make them easy to feed.

Keeping Micro Rasbora Galaxies at home

Creating an ideal environment for Micro Rasbora Galaxies requires meticulous attention to tank setup, water parameters, and tank mates. Here are some essential guidelines to ensure their well-being:

Tank size: Provide a small to medium-sized aquarium with a minimum capacity of 20 liters (5 gallons) to comfortably house a group of Micro Rasbora Galaxies. A larger tank allows for a more extensive community setup.

Water parameters: Maintain a stable water temperature between 22-28°C (72-82°F) and a pH level around 6.0-7.5. Keep the water clean through regular water changes, aiming for 10-20% every week.

Aquarium setup: Create a natural-looking environment with live plants, soft substrate, and plenty of hiding spots. Ensure that the tank has gentle water flow to mimic their native habitat.

Tank mates: Micro Rasbora Galaxies are peaceful and should be housed with other non-aggressive, small fish species. Ideal tank mates include other small Rasboras, Tetras, and peaceful shrimp species.

The Micro Rasbora Galaxy, with its tiny size and vibrant beauty, adds a touch of enchantment to any aquarium. By understanding their size, appearance, behavior, and dietary needs, you can create a thriving and visually captivating aquatic haven within your own home. Embrace the opportunity to care for Danio margaritatus, and you’ll be rewarded with moments of natural beauty and the joy of witnessing their engaging interactions in your own aquatic microcosm.

Scientific nameDanio margaritatus
Type of aquariumFreshwater
Size1.5 cm / 0.6 inches
RegionSoutheast Asia, Burma (Myanmar), Thailand
Ideal tank size20 liters / 5 gallons
Ideal water temperature22-28 °C / 72-82 °F
DietOmnivorous, micro-pellets, live/frozen foods
ReproductionEgg scatterer, no parental care
Life spanAround 3 years
SchoolingSocial, prefers groups


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