Premium koi and goldfish food developed by Blackwater Creek Koi Farms Sinking medicated pellet food highly-effective against bacterial conditions in koi Designed to target where sick koi feed for optimal bacterial treatment Medicated koi food effective against conditions associated with gram-negative and gram-positive bacteria. Designed to sink to the pond bottom where sick fish prefer to feed so they receive the medication they need. For best results, feed for 10 days. Small size pellets. For ornamental pond fish only. Please click on "More Information" for ingredients and feeding instructions.