Danio erythromicron, commonly known as the Emerald Dwarf Rasbora, is a small, peaceful freshwater fish ideal for nano tanks and community aquariums.
Overview
Danio erythromicron, also known as the Emerald Dwarf Rasbora or Emerald Dwarf Danio, is a small, brightly colored freshwater fish native to Inle Lake in Myanmar. It is highly sought after by aquarists due to its peaceful nature, small size (2-3 cm), and vibrant coloration. This species is ideal for nano tanks and community setups with other peaceful species. The Emerald Dwarf Rasbora is best kept in planted tanks that mimic their natural habitat, providing hiding spaces and areas for free swimming.
Tank Requirements
Danio erythromicron thrives in smaller tanks of at least 40 liters. The water temperature should be maintained between 20-24°C, with a pH of 6.5-7.5 and a general hardness (GH) of 5-15. They prefer slightly cooler water compared to tropical species. A well-planted tank with soft lighting and areas of open swimming space is ideal. They also appreciate the presence of floating plants to diffuse light and provide additional cover. Ensure the tank has a gentle water flow, as this mimics their natural environment in slow-moving waters.
Feeding and Diet
In the wild, Danio erythromicron feeds on small invertebrates and zooplankton. In captivity, they readily accept a variety of small foods, including micro-pellets, crushed flakes, and live or frozen foods such as brine shrimp, daphnia, and microworms. To maintain their vibrant colors and health, a varied diet rich in protein and plant matter is recommended. Feeding small amounts 2-3 times a day helps avoid overfeeding and maintains water quality in nano tanks.
Care and Maintenance
Danio erythromicron is a relatively easy species to care for, making it suitable for beginner aquarists. Regular water changes (around 25-30% weekly) are important to keep the water clean and healthy. Monitor water parameters closely, as they are sensitive to drastic changes in temperature or water quality. Additionally, provide sufficient filtration to maintain oxygen levels and prevent debris buildup, but avoid strong currents as these fish prefer calm waters.
Compatibility
The Emerald Dwarf Rasbora is a peaceful species that thrives in a community tank with other small, non-aggressive fish. Suitable tank mates include other danios, small rasboras, tetras, and shrimp species. Avoid housing them with larger or aggressive species that might see them as prey. Keeping them in small schools of 6-10 individuals enhances their natural behavior, reduces stress, and brings out their striking colors.
Breeding
Breeding Danio erythromicron in captivity is possible, though it requires some patience. Provide a separate breeding tank with soft, acidic water (pH 6.0-7.0) and slightly warmer temperatures around 24-26°C. Spawning typically occurs among fine-leaved plants or spawning mops. The female will scatter her eggs, which the male will then fertilize. After spawning, remove the adults to prevent them from eating the eggs. The eggs will hatch in 2-3 days, and the fry can be fed infusoria or liquid fry food before transitioning to baby brine shrimp.