I have an albino cory that has had pop-eye forever. The poor thing just doesn't get any better. I have tried various medications, fungal, bacterial, aqurium salt, melafix.... One eye is about the size of a pea. I feel really bad for the poor thing, but it is swimming and eating fine. I don't want to euthanize it as it is acting perfectly normal. Should I try coppersfae? That is my next attempt. Any ideas?