The best of the best for your fish! 6mm pellet size Medikoi Probiotic growth is a premium growth food suitable for championship koi. With krill, probiotics, prebiotics, spirulina, stimune and 50% protein! Scientifically formulated to significantly improve growth rates through the optimum balance of protein to energy ratio. Developed to intensify the definition between the white and coloured areas of your koi. Probiotic enhanced nutrient uptake for significant reductions in waste.