It's actually a totally digestible food for koi when the weather cools off and as a treat, and I have found it is safe and a woderful treat for my goldies. It is made of many fruits, veggies, grains, etc. (50 types) My ranchu come and pick it right out of my hands. it is a little expensive (1 LARGE box about 80 USD) I think it's great for their health and color. Anyone else like it?

I haven't heard of the manda type but fu is fed to koi. Fu is carbohydrate but if yours has veggies etc in it thats great!