First, I wish you fish well. I can clearly see that you worry about your fish thus ask a questiton in a new forum, so instead arguing about who's is right or know better, can we see a pic. May be one of us here actually have a cure to it once we saw the pic.
From my experience, one reason for the fish eye to get cloudy is internal infection. Did you see his eye starting to protrude and if it is looking abnormal(shape wise, is it only one eye or both eyes)?
BTW, hi there, like it here or not, welcome for stopping by.