All the advice given so far is what I would recommend. 1 snake per enclosure, and I personally would get rid of the wood bark (presuming that it is some sort of repti-bark and maybe a decorative log) and use aspen shavings as substrate (although I would use paper towels or newsprint while treating for mites), keeping them in tubs with two hides and a water dish and not much else. It's not as cool looking but it is much easier to control. Careful use of PAM (follow the instructions to the letter) will help in this case too. I have also used Natural Chemistry's Reptile Relief before and found that it works if you are diligent about applying it, although it definately doesnt work as quickly as PAM.