Orange shoulder and questions


New Member
My orange shoulder tang on the right front has a black mark. Does anybody know what it is. And how much cause for concern it is. I can set up a hospital tank and have sponges in the sump for filtration but do not know how I would get the fish out of the tank without completely dismantling the tank.When I feed the other fish, the fish eats nori very well and also lysis. How worried should I be and can I do anything? The only new addition to the tank is a rose bubble tip But I can't imagine it could sting a tang enough to make a visible mark but perhaps I am wrong. Any information is very much appreciated