i've had a mix/setup sort of similar to this for my B. bohemei who has never shown any inclination to burrow, and it seems to be keeping okay humidity for the last three or four months. while i don't think this is the most practical substrate idea (or the best thing you could do for the T), it looks pretty sick and makes it look like a true display enclosure.my plan is to use straight coco fiber for most of the enclosure, but to use a mix of excavator and coco fiber for the outer most layer, let it dry and harden to kind of hold the whole thing together. Watering will be from the bottom so the pure coco fiber should stay moist, while the outermost layer dries out. I've designed an enclosure that will have a little trough on the front that should allow the bottom 2 inches of the enclosure to remain moist, while the remainder dries out. Also, this cage will open to the front and have a slope. The entrance to burrow will be on the side of a "cliff". I've ordered plexi and it should be here tomorrow, I'll take pics of the enclosure when finished.