Hi, to be fair there are so many growth foods out there, my view on this is that unless your koi has the potential to grow fast and large then forget growth foods, I used a high protein food last season and only 3 koi out of 34 showed any kind of growth
You really need heat very light koi stock and the right koi to grow, other wise just use a staple koi food…
Saying that boo on here had some fantastic growth from an ochiba 