ive got a colombian rainbow boa, hes in a plastic tank was on newspaper substrate,now on repti carpet. the humidity takes care of itself in these tanks,, mine will eat anything, dead or alive, always sheds in one and is in brilliant condition. you dont have to be that anal about temps, humidity etc, as some say. i haveseen one that was dried out though and it wasnt nice. i have a heat mat on the wall so no chance of burns, when i can be bothered i,ll post a pic of my setup.