first off i don't see any reason to move him to a feeding tank. in my opinion you very well condition him to expect to be feed when you reach in to pick him up doing that. second it's sounds like he's behaving like he's hungry. how much and how oftn are you feeding him and how big is he. and most importantly you really shouldn't worry about getting bit by a ball python. it's really not painfull, it leaves little to no lasting damage. and the fact is if you are going to keep any exotic pet, including snakes you more than likely are going to get bit sooner or latter.