If the humiditys right it won't be to dry but if it's to low add some more water. And the best way to add water is dog a little hole in the corner of the enclosure then dump the water in it then cover the hole back up that way the bottom layer will be dry and the top wet!
Great thanks, iv always been told to put my tortoise on Wood chip substrate but after doing some research iv changed that right away, I'm just a bit concerned incase I make the bottom of his coco coir to wet.