I beleive they have really high phosphorus. That's the reason for dusting them every time I feed them off. But they are full of moisture.
Actually, they are naturally high in calcium. They build up calcium oxalates in their system (specifically their Malpighian Tubules, which are more or less like a vertebrates kidney) as they grow. You can dust them, but not necessary every time (of course depending on age of cham being fed) just use normal dusting routine. If they are eating silkies exclusively you can even back off on the calcium dusting a bit. Personally, with my adult herps, I never dust them with Ca. They tend to 'binge" on them for a while and then get bored with them.
Good to know. I think I misread a nutritional chart somewhere. My cham is 9 months old right now. When should I stop dusting (ex. what age?)