I have 18, 6 week old girls. Should I have the brooder light off at night? We live in the San Diego low Mountain area so it doesn't get lower than 50 degrees now. They are fully feathered but do gather under the light still. They are out in their yard during the day. Also, I read about adding oats to pullets food at this age, up to 50% gradually to slow growth and have better layers. What kind of oats, the feed store has quite a variety. Thanks for the help!