Just got a 2013 BRB and have him set up with a 40 gallon, heating pad, hide, large water bowl (large enough for him to soak completely), 2.5' grape branch, and some plastic flowers and vines for decoration. His substrate is 50/50 bark/repti-bark (I think?) to keep humidity up. It got coooooold last night and he has buried himself in his substrate. Is a heat lamp necessary? Would that compromise humidity? Should I be misting?