yea the same as everyone else says; as long as the substrate isn't too moist you should be fine to avoid scale rot.

If you find your snake is having problems shedding just add a moist hide; I use an old ice cream tub with a hole in the side full of semi moist coco-fibre (I "wring" out the moisture until I can clump it in my hand and either none or only 1 drops of water drip out)and moist sphagnum moss in the bottom to kep the moisture. My snake has used his moist hide to shed everytime since I added the hide.