im interested in building my own rack for the group of females i have. i have a solid shelf with adjustable shelves that i would be able to screw in place to accommodate some tubs for the geckos. i was wondering how would i control the heat with something like this? using heat tape and a temp controller, or dimmer, isnt there a problem with one shelf getting hotter than another, or the middle tub getting hotter? where would you place the probe with a temp controller, the ones that turn the tape off if it gets too hot? can you place the plastic tubs right on top of the heat tape? with my shelf having a solid back and sides, wouldnt the heat build up very easily? ive seen the thread on building your own rack, but like i said, im still confused about temp control.