I have to be out of town for a week and am concearned about my chickens. I have noticed when I feed my half grown barred rocks they will eat it all within the day, my reds will eat the same amount in about 2 days. So my question is if I put a 30 pound feeder in there and fill it up will they eat themselves to death, or eat it too fast? I can not find a portion control automatic feeder(at least one I can afford). I have already devised a plan for watering them, either leaving a drip in a pan or install a swamp cooler float to keep it full, so the food is my big concearn. Thanks.