In all liklihood, the regal tang is the one chewing up the YTs fins. Tangs tend to be territorial, which is why it is recommended that adding tangs together in a small tank is a recipe for disaster. YTs can easily reach over 5" in captivity and 8" in the wild. Blue tangs can reach 10" max. in the wild, so that is why many reefers will warn you (with good reason) not to have these tangs in such a small tank. I would get that YT into a separate quarantine tank ASAP & look at either upgrading to a much bigger tank or finding it another, more suitable home.
Not what you want to hear, but.....
Anthony
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