Thank you! I have him in a 40 gal aquarium. My humidity is at 70. Im planning on buying coco coir to add more humidity.Do you mean humid box? Sulcatas need 80F temps and 80 percent humidity, so if your enclosure cannot maintain these you need a humid hide area for him. A log will not suffice. If though you have a closed chamber enclosure that stays warm and humid everywher then a log is sufficient.