I should get my exo-terra terrarium delivered tomorrow (12x12x18), which I plan on housing my 6" P. regalis in. At present, I plan on using a 11x3x3 sunken water container with pebbles for a natural look and to add humidity. I've been entertaining the idea of using a small exo-terra water fall instead, but I'm wondering if this will add too much humidity to the environment. I haven't seen a waterfall being used in all the terrarium pics I've searched through, so I figured it couldn't hurt to ask the community. I think it was Talkenlate who was experimenting with an all water bottom, so the waterfall might work.