Also i found out that water bowls are useless they never go near them and it makes the tub too humid i keep mine on play sand and i soak my FT mice for awhile and keep them dripping wet when i feed in a smaller size tub that i sit in the main en-closer so when she is done eating she craws out and goes in the sand on the hot side.
I've actually seen mine come out and drink from the bowl. I offer water twice a week. I haven't seen any problems with humidity here.