For one, they need seperate enclosures.
Kings DO eat other snakes, but there are far more important reasons to give them each their own enclosure.
Snakes ARE NOT SOCIAL. Most species live solitary lives their entire lives except for breeding time. They have NO use for companionship in any way shape or form.
If one gets sick, the others are automatically sick. No good breeder keeps stock in the same cages. It's risky, cheap and asking for trouble. If one regurgs how will you know which one? If one has bad crap, which one did it? You'll never be able to PROPERLY moniter your collection if it's all living in the same cage.
Another reason to seperate them is that there is not ONE good reason to keep them together. Not one. They have no buisness living in the same enclosure, rubbermaids cost 5 bucks a pop and heating pads cost less than 30, a workable heat controlling device can be made for cheap as well, or purchased. This hobby has no room for saving money, so start out right and get your kings their own enclosures now while you still can.
Take this as advice please, not an attack or anything.
I am just trying to help you out. I love kingsnakes, they are my favorite snake species and you will also enjoy them very much, but you MUST keep them properly if you want to get all the wonderful things this species can offer which includes babies one day.
Marisa