tub questions---

can i slap a uth under a sterilte tub and have no problems? how do i keep my humidity up? how many holes are sufficient?

on a rack setup like boaphiles, do i need a thermostat for each tub?

you can put a UTH under a sterilite, but you better have it on some kind of rheostat or thermostat cuz most will run up about 100* which is BAAAD. Rack thermostats will depend on species. You could have one thermostat controlling multiple cages if the heat requirements for each species are the same. I have my thermostat controlling the flexwatt for my BP and my two carpets, but they both like the 87-90* heat range.

thats how my racks are set up, as stated gotta have a stat.