I just re read your message. I didn't see anything about vitamins he's getting. Adult chams should get a dusting of herp vitamins (such as Reptivite with beta carotene) about once a month. If he hasn't gotten this, and you are not gutloading his feeders with fresh leafy greens, fruit, and fortified cereal grains (at a minimum) he's probably got a deficiency. Check those 2 websites for vitamin supplementation information and check your husbandry over again.