I have an oscar fish and recently the power went out for 3 days. I was gone for a whole 24 hours before I got back and the temperature (which was freezing during the days the power was out) went back up to the 70's. I think it has something to do with the water temperature changes. Now he is laying on the ground and hardly moving or eating with fuzz all over him. What should I do? Is there anything I could do and what is wrong with him?