So, I successfully treated my tank from ich, but one tiger barb is not doing well. All of my fish fully recovered and are acting normal. But, the tiger barb was swimming nose down, and has what appears to be an open would from infection. I have him in a small tank by himself for now, but what can I do to treat him? 
I don't want to wait too long, because he's not doing well.
I don't want to wait too long, because he's not doing well.