Well I have three Koi in our pond and I was cleaning it this week. I pulled the fish out and placed in a seperate container. I then noticed that one of the Koi has about 5 of these white 'bumps' that are about 1/4" round all over his body. I tried looking it up in some books that I have but no luck. Any idea what this is? Is it fatal, unhealthy? Sign of something wrong in the pond? Test indicates nitrites and nitrates are at safe levels. Think I should quarantine him from the other two?