Thanks! Right now there is not nearly enough substrate because I just got the 75 gallon tank after having a 29 the whole time. I just ordered a new carpet, but it will be about 6 days before it gets here. I'm thinking of laying a towel down before then. I'm also wondering if maybe the stress of being in the new enclosure is what's causing him to be so obsessive about lying on this ledge. Thanks for your response!