Thanks much for the excellent write-up. Your website has proven quite valuable to me in the past so this just adds to the list.
I don't have any anecdotes about miraculous cures from yogurt, but I do have a question about it as a food suppliment.
(I apologize in advance for going off topic, but I think KFG's original question has been wonderfully addressed in several posts

)
I've read on another forum about the health benefits of lactobaccillus for koi and a few who have talked about using yogurt as a base for blending paste foods. Since yogurt is commonly used as a digestive aid for people I am curious if it would likewise be effective and beneficial to koi.