It sounds like a great temp range for most tortoises. If size isnt much of an issue, leopard or red foot tortoises would be a good choice. I think most torts can take a night drop down to 60 without much problem. The leopards would definitely benefit from the low humidity. The redfoots would probably need a spray every other day or so a large shallow water dish. Their skin definitely gets ashy looking when too dry. The night temps sound fine too. I would provide them a basking light for the day around 90 degrees, and definitely UVB. Maybe a nice little combo heat/uvb bulb for the day basking area at one side of the cage. As far as substrate, I have good results using regular cypress mulch from a hardware store or plant nursery. Cheap, holds moisture if needed, drys quickly, and seems pretty absorbent for feces/urine. Looks nice too. It does get a bit dusty when kept dry, and I think any natural mulch or soil substrate will have the musty organic odor to it in an enclosed room. However, I dont find the cypress to get overpowering.

Good luck.

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