If substrate is bad why do petstores insist and include it in set ups? besides just to make a dollar? Some substrate says its ok if it gets injested...not that i ever trusted it...im just curious. how sturdy are chams in general? i had never heard of not having substrate in a chams cage...i had a living vivarium...so i had substrate....i just worry about my juvies whom have gotten brave and decided to drop after seeing how long they can hang with hind feet and tail....this only happened the first few days, im glad they stoped climbing the top screen.