I have no idea what it is... I've been trying to get a picture but he won't give me a good shot. It's not a white patch on the skin but it is like attached along with a very small black thing to his left gill. It's clearly annoying him as he is trying to gently rub the gill against my rio pump. He was fine last night with no signs of agitation... any ideas? Maybe something is stuck to the gill? Don't know if its a parasite or what... no signs of anything else on any other fish and nothing else on his body. And other than the gill rubbing on the pump, he behaves normally. Thanks for any assistance, I'll do my best to get a photo but didnt want to wait to post.