help with my clown fish

[chefsung]

hey guys i just got home today from being out of town.. i had a friend come by my house and feed my fish last night but he told me some thing was wrong with my fish... and i came home just now and saw it it looks like a buffy eye... like pink eye for fish? how do i treat it? and what am i suppose to do with him? do i take him out? can others get it from him? what casuses it? and what should i do... any help would be awesome thanks!