Hi everyone we have had drake 4 weeks fed him three pinkys. He is a 05 hatchling and he is in a 30gal tank with uth at 90 deg at glass also red heat light 83 deg air temp hot side. 68-72 cool side he is eating fine he wanders around at nite regulating in his three hides. I have keepers choice shreded bark.I have yet to find poop unless he is pooping under ground also no smell My question is how often to change substrate thanks Tom