so the last day or two i noticed that he has been less active and kind of staying to himself, so i took a closer look at him about ten minutes ago and noticed that his eye was covered in a grey colored slim and its seems like he cant see out of it.i believe its called cloudy eyes(or something like that). my question is what medicine would work the best to treat him?should i moved him to a separate tank to treat him?(if so how big?)any additional info will be appreciated . i will have pics up soon.