So, since getting advice from you guys, I have been feeding him every week. Rat pinkie every Wednesday. But he seems to be climbing more! Just in case, I did put clips on either side of the tank, in fear he'd manage to push it up far enough to get out. While Jasper seems to prefer mice, he is taking the rat pinkies for now. I still have yet to *see* him climb, but it still scares me that one too many falls and he's gunna kill himself...