I have a chicken tractor with coop attatched that i moved my 15 RIR into at 4weeks old. I put food and water into the coop and had to put in a light to get them to go inside at night. Now they are 9 weeks old and go inside and roost before i turn the light on. Do i still need the light and food and water at night? I was told they are still growing and need the light and food/water so they will feed at night. What do you guys do? Thanks.