You can save yourself a good deal of grief by providing a normal bedding like aspen bedding, leaf litter mulch, soil/sand, cyprus mulch... The bedding itself does not have to be humid. The important point is to provide a humid place where the tortoise can retreat to. Red Foots do not have to be kept humid all the time. You can provide a humide (typo but I think I'll keep it)(Humid Hide) by cutting a hole in a large enough rubbermaid container and filling it with whatever substrate that holds moisture. I recommend a fine sand to avoid bug problems.
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Ed
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Trying to keep the fun in Chelonian care