Least Rasbora

Boraras urophthalmoides requires very small foods due to its tiny mouth; staple foods should include micro-pellets, baby brine shrimp, daphnia, and vinegar eels. Infusoria and micro worms are excellent supplemental live foods, especially for conditioning breeding adults. Feed small amounts two to three times daily to maintain health and vibrant coloration.

This species is highly social and must be kept in groups of at least eight individuals to feel secure and display natural schooling behavior. In smaller groups or when kept alone, individuals become shy, stressed, and prone to hiding. When comfortable, they are active, curious fish that loosely school through the mid-water column among fine-leaved plants and floating vegetation.

Boraras urophthalmoides is an egg scatterer that will spawn among fine-leaved plants such as java moss in soft, acidic, slightly tannin-stained water. Adults do not guard eggs and will consume them, so a separate breeding tank with a mesh or moss bottom to protect eggs is recommended. Eggs hatch in approximately 24-36 hours and the tiny fry require infusoria or commercial fry foods for the first week before graduating to micro worms and baby brine shrimp.