I cut and pasted this from a post I made earlier this week:
It's true that a constant high humidity is a bad idea for uros (over 50% is the general number tossed out), but I think it's good to have a humidity gradient available to your uros just like a good temperature gradient. They can choose what feels comfortable to them that way but not be forced to live in the damp. I have a dry substrate, plus rubbermaid tub den hide in the uro cages with a soil/sand mix that I keep slightly damp. It's the most frequently used hide.
A small water dish will not kill your uro, either. Some actually do drink from a dish, and as long as it isn't a swimming pool, it won't make a hint of difference to the overall cage humidity. I'm more concerned about them walking through it and getting stuff stuck to them. I have water dishes in each cage right now available during brumation - I don't keep one in there during normal times.
Others undoubtedly have different thoughts, but it's worked very well for me.
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Torey
Eugene, Oregon, USA
1.1 Uromastyx Geyri (Joe and Arthur)
2.0.1 Uromastyx Dispar Maliensis (Tank, Turtle, and new neighbor Spike)
1.2 Anolis Carolinensis (Bowser, Leeloo, and Sprocket)
1.1 African Dwarf Frogs (Bruce and Sheila)
1.0 Betta Splendens (Mr. Miagi)
1.1 Felis Domesticus (Roscolux and Jenny)
And several miscellaneous community fish
