One of my fish have popeye ! help

[Daniel475]

so i noticed it today looks pretty gross and bad ... i did a 15 percent water change and i am treating with melafix? just started today removed carbon etc.. anything else i can do to speed this up? and should his eye be ok? how soon does it take pop eye to develop? im sure it wasnt there a few days ago? also was wondering what kind of cleaning tricks you guys use to sanitize your sinks etc when u clean your filters and stuff in them ! thanks

dan