Hello fellow chicken enthusiasts. We are new to raising chickens and have 15 chicks that are now almost 6 weeks old. Barred Rocks, Black Astrolaups and Buff Orpingtons. We live in a somewhat mild climate but it may snow this week. My question is regarding their light for heat in the chicken coop....can I turn it off now or will they become too cold at night? I have provided roosts for them that are 6 inches off the ground but every morning I find them huddled under the heat lamp. They have lots of feathers and are outside all day or at least going in and out. Also, up until now I have been sprinkling chick grit on their food every morning. What is the next step for their access to grit? Any helpful opinions are appreciated. Thanks!