looks like everything cleared up nicely for you, I had a yellow tang whos eye looked exactly like that and it was a result of pop eye that progressed to far, the lfs was going to throw the poor thing away so I took it, dosed melafix, and after everything cleared up that's what the eye looked like. That tang went on to live a long healthy life. Good luck with that beauty, may you get many years of enjoyment out of him/her.