These spots are embedded in the tail. They don't scrape off
The 3 fish are in a 55g now with the salt at 3ppt. I'm trying to find someone local to look at them.
I have 3 other koi in a seperate area. One of them, a 4-5 inch gin doisu yamabuki had the problem on the tail also. After it cleared up, I moved it into a tank for 3 weeks, and then put it into the indoor pond with the others. It has been clear ever since. If I could just get these three to that point.
The spots really don't look like the pictures of virus, but I'm trying to find someone around here that has better eyes than me.
The dealer reported no other problems with his tanks or with his other clients. He did have a tank that was separate from the one my fish where in that developed ick, but he cleared it up with heat and salt within a week.