The tiles should not be perfectly smooth, else your dragon won't be able to get traction to move around. A rough finish is good (should be able to feel the texture with your hand but it doens't have to be so rough it hurts to move your hand over it roughly).

If concerns over the tile being too cold, an area of reptile carpet can be put in underneath the dragon when brumating but unless the room temps drop below (or the tile temps) 60F there shouldn't be any problems.
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PHLdyPayne

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