Please help, how to treat a sick fish in reef tank ?

[reef93]

My Coral Beauty Angel is having a cloudy eye for more than a week now. I don't think it will heal by itself without the treatment. I can't set up a quarantine tank and I can't catch him/her either. Does anyone know what kind of medication is reef safe. so I can treat this poor little one before it goes blind ? I have running bio pellets, is it going to effect the bacteria if I am using that kind of medication ? Please tell me if any of you had been using or had experience with it.