The Sundadanio axelrodi, commonly known as the Blue Axelrodi Rasbora, is a small and peaceful fish species native to Southeast Asia. Here's a detailed description:

Physical Appearance:

Size: Blue Axelrodi Rasboras are tiny fish, typically reaching a maximum size of around 2.5 centimeters
Coloration: As their name suggests, they display striking blue coloration. The body is usually a shimmering metallic blue, with darker blue markings along the sides and fins.
Shape: They have a slender, streamlined body typical of most Rasboras, with a slightly forked tail fin.
Sexual Dimorphism: Males tend to be more colorful and slightly smaller than females. Females may have a rounder belly when they are ready to spawn.

Habitat and Distribution:

Natural Habitat: Blue Axelrodi Rasboras originate from the peat swamp forests and blackwater streams of Southeast Asia, particularly in countries like Indonesia and Malaysia.
Water Preferences: They prefer soft, acidic water conditions, typical of their natural habitat. A pH range of 6.0 to 7.0 and temperatures between 22°C to 26°C are ideal.
Tank Setup: A densely planted aquarium with subdued lighting and areas of open swimming space mimics their natural habitat. They appreciate hiding spots among plants and driftwood.

Behavior and Compatibility:

Temperament: Blue Axelrodi Rasboras are peaceful and social fish, best kept in small groups of at least 6 individuals. They are ideal community tank inhabitants.
Tankmates: They get along well with other peaceful fish species such as other Rasboras, Tetras, small Gouramis, and peaceful bottom dwellers like Corydoras catfish.
Feeding: These fish are omnivores and accept a wide range of foods. They enjoy small live or frozen foods like daphnia, brine shrimp, and bloodworms, as well as high-quality flake or pellet foods.

Breeding:

Spawning Behavior: Breeding Blue Axelrodi Rasboras can be challenging in captivity, requiring very soft and acidic water conditions. A separate breeding tank with gentle filtration and plenty of fine-leaved plants for egg deposition is ideal.
Egg Scattering: They are egg scatterers, meaning they scatter their eggs among plants. Once spawning occurs, the adults should be removed to prevent them from eating the eggs.
Care of Fry: The fry are tiny and delicate, requiring infusoria or commercially available fry foods until they are large enough to accept larger foods.

Special Notes:

Schooling Behavior: Blue Axelrodi Rasboras feel more secure and display their best colors when kept in groups of 6 or more.
Acclimation: They are sensitive to changes in water parameters, so acclimate them slowly when introducing them to a new tank.
Care: While they are relatively hardy once acclimated, they still require stable water conditions and regular maintenance to thrive.

Overall, Blue Axelrodi Rasboras are beautiful and peaceful fish, perfect for aquarists looking to add color and activity to a small community aquarium.

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