Yep if you have mites you want your enclosure easy to clean. If no one has mentioned it get some Provent-A-Mite....use it exactly as intended as it's VERY strong stuff but there's simply nothing better to get rid of mites efficiently.

Basically what you want in a hide Ed is easy of cleaning, sturdy so the snake can't shove it around too much, very snug so it's barely bigger than your snake when it's curled up, dark in color, small entrance either on top or on the side. We've always found that our snakes thermoregulate best if both hides are identical in every way. If not they can and will pick a favorite hide then stay in it even if it's not the best thing for them to be doing.

It may be your snake is just not used to the new hide yet. They can be picky that way. Also check your temps inside the warm side hide. Sometimes depending on the construction of a hide it can build up a fair bit of heat inside the warm side hide and make the snake less than comfy in there. You may need to try a few hides to find the one your snake will use. We use everything from terracott planter saucers, to dark blue plastic cereal bowls to big black rubber dog dishes....cheap, easily to clean and the snakes love em! There are a lot of folks on here that use plastic planter saucers from Wally World that are dirt cheap and work like a charm! Jamie Glass I believe (jglass38) has pics of some so check out his threads for those.

Use the search function using the word hides and I believe you should find a fair few threads with some pics to give you ideas on hides.