Eye problems in my Flame Angel

[lindsayf]

UPDATE: the eye doesn't look any better and now his back fin looks a little ragged. He still eats well but spends a lot more time hiding in the rock. I did a 5 gallon water change (20gallon tank) and have been treating with Melafix daily. I think its time that I medicate him - should I take his tank mate (a green clown goby) and put him in my main tank if he's not showing any signs of illness? Also, my quarantine tank has some crabs and snails in it, are there any medications that I could use that are invert friendly or should I set up a new 10 gallon for treatment? Thanks for your help - I'm really worried about him.

Lindsay