-Well, Mickey, you were right....my poor koi died the day after I got your message-I was so bummed...and I felt so badly that the poor fish probably suffered more than it needed to because of my ignorance as to how to treat it. But, I have learned alot from this site, and although I don't intend to buy another koi, if one does 'slip in' the way this one did, at least I'm armed with more knowledge-and probably all that I've learned will pertain to my goldfish and comets as well, so although I hope none of them go through what Neptune did, at least I'll have a better handle on caring for them. Thanks again everyone.