Hi i have been using Nishkoi for a few years now .And i am totaley sure that i would recommend them to anyone. The last pond i had grew my carp on from 4 inch to to 22 inch all on Nishkoi food .
I have kept koi for thirty years and have always fed them Nishkoi. Have rarely had any problems with their health due I feel is due to the quality of their diet.