I went about a week, withholding food at night for my FR to keep them from getting TOO fat, too fast...needless concern it would appear as their growth rate has now significantly slowed down and tehy are back to getting feed at night again. However, while they were without feed, we had no incidents of violence or cannibalism. I dont leave lights on at night in the barn, and they all just curled up and went to sleep. Seems they limit most of their eating in the coop to thirty minutes or so after going in (while the lights are on so I can do chores), and from the time the sun shines through the window- they are always hitting the feeders hard when I come in in the morning. I wouldn't worry too much about them hurting eachother, judging form my experience. You can just get a bigger feeder- like a five gallon homemade one even- then you dont have to worry about them running out at night-I have 90 rangers, and that usually lasts at least two nights.