I'm gonna go out on a limb and guess that the humidity range in your big tank is ok. However, maintaining that big ol' glass tank can still be a pain...especially for a critter that doesn't really need it.Originally Posted by Naf Eeknay
A shallow, plastic tub will hold humidity in perfectly, with no effort on your part at all. I'm in Tucson where it is super-dry most of the time...and when I switched to plastic, I actually had to tweak it a few times to keep the humidity from getting too high! (More holes put in the tub...and always making sure the water bowl is on the cool side.)
As for size of holes...a regular soldering-iron will make the perfect sized holes for you, without risking cracking the plastic or making sharp edges. Just make sure you do it outside or in a very well ventilated area!