Well I found a 15 quart storage bin laying around so I switched him to that he seems to like it more but hey what do I know. Hate to be a bother but I'm thinking about switching my heat pad to flex what if I got the 11 inch and let some overhang from the side of the cage will that be fine so that way I can use it for progressively larger enclosures as he grows. Again thanks so much for the quick responses and your help.