The switching the tanks to reduce biting is false. With some people it may seem like that works, but with the majority it makes no difference. For 14 years I've fed all my snakes in their same enclosure, and this being around 30+ snakes at once, and they don't show aggression to me. I handle mine frequently, so they know the lid popping isn't always "food time." It's when you don't handle them often, that they see any movement in their enclosure as a food item since they aren't used to it. But all my snakes, on feeding day, at night, during the morning, during brumation, anything are all fed in their enclosure with no change in their normal behavior.