I have had both koi and then goldfish. I tried cheaper food and the fish reluctantly ate it. I got this food and the difference was dramatic, the fish gobbled this up immediately. You can tell it is great food because it has a smell, too. I noticed the baby dish were retaining their colors better and my fish were growing bigger than my neighbors fish were. I would not guy anything than this for my fish! It is not cheap but the fish are healthier and there is less fish waste with this low ash food.
Rating: [5 of 5 Stars!]