I've seen this quite a few times, in fact the first Oscars I ever got developed a slight film over one of their eyes. In fact, it was only a couple of weeks ago that one of our members posted a question about this subject.
Obviously I haven't seen your Oscars so I couldn't be absolutely sure what it is. However, it does sound like what I have already mentioned. If this is the case, I don't really think you have anything to worry about. When my Oscars have it, after a few days, it peeled off rather like if you had a piece of glue stuck to your skin. I think it's probably caused by stress, or maybe the change in water conditions, I really don't know. Just keep an eye on it, and keep your fingers crossed that is what I am talking about. If however it starts getting worse and the eye looks like there is definitely a problem, get back to us with some photos please.
