He is swimming normally, he eats, he looks fine all the way around. The other fish in the tank look fine, no issues. I just did a water change yesterday -same as I alway do. I have well water, no cholorine ect. I went to feed them tonight and noticed this one fish who has both of his eyes look bloody around them, cloudy like almost a film over the actual eye. No texture like bumps or fuzzy looking stuff. No bulging or swelling. One eye looks like it might be set inwards too far. He looked fine last night when I fed them, so whatever this is it happened fast. I can't imagine an injury, unlikey to affect both sides at once? how odd. I don't know what to do for him. ? Should I quarantine him? I don't want to stress him but maybe treat him w an antibiotic? I have added no new fish, the tank and the whole shebang has been going now for 18 months. I also don't see any thing in the tank he could have gotten caught on injured on. It is a 65 gallon tank, I don't have much decor in it, lots of swimming space, I have not noticed anyone fighting ect. Any ideas I'd appreciate!