This food is purely for colour enhancing but it can be mixed in with another type of food. It is low in Protein, but high in Astaxanthin and Vitamin C/E. The low protein levels enable the koi to maximise its utilisation of the Astaxanthin and Vitamin C/E. So although the food is not designed to make the koi grow, the Astaxanthin and Vitamin C/E enhance the various colours on the koi, as well as creating brilliant white areas. Vitamin C & E together boosts the immune system, fights disease and increases metabolism. This food is perfect for preparing your koi before entering koi shows.