The Axelrod Red Danio, scientifically known as Sundadanio rubellus, is a captivating and relatively rare species of freshwater fish native to the slow-moving, heavily vegetated streams of Borneo and Sumatra. This diminutive fish is prized for its vibrant red coloration and peaceful demeanor, making it an excellent choice for nano aquariums and community tanks with other small, non-aggressive species.

Axelrod Red Danios are characterized by their small, slender bodies and striking red hues. The intense red color is most prominent in males, particularly during breeding displays or when they are in optimal health. Females are generally less colorful, exhibiting a more subdued red or pinkish hue. The iridescent scales of both sexes can shimmer beautifully under proper lighting, adding a dynamic visual element to their appearance.

In captivity, Axelrod Red Danios thrive in a well-maintained aquarium that closely mimics their natural habitat. A tank setup should include plenty of live plants, such as Java moss, Anubias, and floating plants, which provide cover and create a sense of security for these shy fish. A dark substrate and subdued lighting can help enhance their colors and reduce stress. Given their small size, they are ideal for nano tanks, though they can also be kept in larger community tanks with other peaceful fish.

Water conditions should be soft, slightly acidic to neutral, and well-filtered to maintain high water quality. Regular water changes are essential to keep the environment clean and stable, as Axelrod Red Danios are sensitive to fluctuations in water parameters.

These danios are schooling fish and should be kept in groups of at least six or more to promote their well-being and natural behavior. A school of Axelrod Red Danios can create a vibrant and lively display as they swim together and interact with one another.

Their diet should be varied to ensure they receive all the necessary nutrients. They readily accept high-quality flake foods, micro pellets, and live or frozen foods such as brine shrimp, daphnia, and bloodworms. Providing a mix of these foods will help maintain their health, vibrant colors, and energetic behavior.

Breeding Axelrod Red Danios in captivity is relatively straightforward, provided the right conditions are met. They are egg scatterers, typically spawning among fine-leaved plants. To encourage breeding, the water should be slightly warmer, and the breeding pair should be conditioned with high-quality live or frozen foods. Once spawning occurs, it is advisable to remove the adults from the breeding tank to prevent them from eating the eggs. The eggs usually hatch within a few days, and the fry can be fed with infusoria or finely crushed flake food until they are large enough to accept standard fare.

Overall, the Axelrod Red Danio is an excellent choice for aquarists looking for a small, colorful, and peaceful species. Their stunning appearance, gentle nature, and ease of care make them a delightful addition to any well-maintained aquarium. With proper care, they can thrive and bring a burst of vibrant color and lively activity to your aquatic setup.