I've been thinking about getting two or three Red Foot Tortoises for a while now. I just have a couple of questions. I'm gonna set up a 75 gallon tank for them when my Red Eared Sliders get upgraded to their 150 gallon. How long will 2-3 Red Foots be able to live comfortably in it? I live in Utah, so it's pretty dry. Would the low humidity be a problem for keeping them outside once their big enough?