Every time he poops. which isn't every day since he isn't eating well, i clean his cage with a 50/50 bleach and water solution and follow up with white vinegar to get all of the bleach out. Then i let his tank air out for an hour and put his stuff back. For now, since he only has paper towels and his basking rock i soak the basking rock and then switch out the paper towels after bleaching. However, yesterday i ordered a Coccicidal Concentrate to clean with and make sure its all gone. By the way, do you happen to know how he could've gotten these parasites?