On a related note, I've noticed that two of my garters seem to prefer sleeping in the water enclosure instead of the land enclosure (see my enclosure thread to clarify if necessary). The brick I have the hide set up on is very porous and is practically always wet, so I think it's because they like the water.

Temperatures vary between 80 and 87F, and I have a 100w incandescent bulb above the land enclosure.