Dehydration is the problem, when we use temps the same all day long, its not natural. If you think in the wild temperatures vary throughout the day.
I would suggest feeding wet food during the Winter, or even hibernate your tortoise if you dont do so now. As this helps too:0)
Also you might be able to put your heat and light on a timer during the day to vary temps.
Tortoises also dont need any extra heat at nightime, the heat of the house is enough.
And soaking in a solid container, not one they can see through, as if they can they want to be out:0)
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