we feed our snakes and lizard in completely seperate tub that is clean with nothing else in it and that is all that tub is used for. Depending on what you use for substrate you run the risk debri going down with the meal. Not so much an issue for newspaper or similiar lining but I still choose to do it in a seperate "clean" area. The whole feeding in their every day enclosure deal...well I've seen it both ways with snakes I've had going into hunt mode but its not my personal underlying reason for the way I do it.