That really sucks, I can't get him no matter what i do. and i just put him in the tank,OwellLooks like a bacterial infection to me David. You need to remove the fish and treat it.Remove it quickly so it doesn't spread to your other fish
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Tobin, the one nip on it's fin was my powder blue when i first introduced it. He was chased around the first day. now he is one of the family and he is eating everything i put in the tank.What about the nips in it's dorsal fin? Is there any other stress aside from the marking on the tang? What is it eating? The marking seems to have spread a little more since I sold you the fish. I am more than happy to return payment and get the fish back if it spreads more.. The fish was in my system for a while with the markings, just a little less eating well and happy.. Or I could just give you the payment back and you hold on to the fish and see what happens.. Only because I know your system was very good before your rebuild.. I do hope that the fish thrives.. LMK..
I don't know, it looks like the start of lateral line. It's originating on the face and looks to be following the lateral line symmetrically which are classic signs. There's no inflamation and the tissue looks intact except for the top layer. It's too patterned and clean to be bacterial, I would bet money on it being lateral line. What are you feeding him generally? Tangs and Angels are notorious for this as their dietary needs are not fully met by most keepers. It's not contagious but I have yet to see a fish make a full recovery from this myself. I'm afraid the black tang is going to look like that or maybe even get worse. It shouldn't kill him but I'd imagine it's the same as suffering hearing impairment.