What's the cage humidity level? A dehydrated cham won't eat either. How old is this cham? Where did you get it? How often are you dusting with calcium? If he's a juvenile or an adult don't dust with calcium every day...too much. If he's a hatchling dust LIGHTLY each day. Vitamin dusts about once a week. For an adult, vitamin dust once a month. What are you gutloading your feeder insects with? Gutloading well is very important and safer than relying on a bunch of dusts.