My Royal was really lethargic today and just hung on the glass. He usually hangs out in his cave during the day and only comes out at night. He has been eating well up until today. Neither his eyes or stomach are sunken in, but his eyes look like they have a white haze over them. Any ideas what might be wrong with him. Ammonia and Nitrites are both at zero, nitrates about 10. pH 6.5 (not change), temp about 75F. No new additions to the tank or anything else I can think of that might have caused stress.