Friend called me last night, said his large fish ich he thought. I went over and looked, sure enough he is covered in salt all over his fins and tail. The weird thing is, it must be ich, he added a new fish a cpl weeks ago, but this is the only fish in the tank with any signs of it. It is his largest fish, but no catfish, plecos or other fish have it yet. Is this normal, in the past when I have seen ich it effected everyone in the tank, but this is seriously just one fish and its pretty bad on him.