Get your guy out and get him to urinate in water. I've seen some clouding like this in their urine and have had it tested for bacterial and other pathogens with nothing found. I believe it is due to some kind of imbalance in their system or slight dehydration. Its always a thick mucus like cloudy substance, but have never seen any discomfort or harm come from it. Usually occurs after my guy has been down for a few days and I get him out to bathe him and feed. Has been clear for month now though.