Thanks for all your replies everyone I really appreciate the feedback. I went ahead and ordered a pair of the large sized ones. If push comes to shove I can store those and get mediums for her to grow with. A few people mentioned packing the extra space with moss etc. Would anything else work? She absolutely hates sphagnum moss. The two times I put it in her cage she refused to go anywhere near it. I'll post pictures of my setup next week when everything arrives. Thanks again!