I tried keeping them separated

[stangs13]

I guess it is just hard to want to stick them in a tub.. but i guess to them it is more like a natural habitat.

I just feel bad sticking them in a little dark tub with no crawl room and nothing to do.

They arnt rats. No need to crawl around too much, they don't loose muscling like we would if we just sit around. All my snakes are in tubs and thriving, eating all the time, and growing big. Yes, just put the UTH under the tubs as you would with a tank.