I have 6 hens (NHR, RSL, and WR) and a WR rooster in an uninsulated coop. I have a ton of hay and shavings in there, a red bulb heat lamp and a heated waterer....... Should I add another lamp or will they be ok?? I have been feeding extra cracked corn and they get layer pellets and grit daily. Also treats every 2 days or so. Will they be ok??? I thought I saw some frostbite on their combs, and I am not letting them outside until this cold spell is over. Just wanted them to be safe while I am inside toasty warm. Thank you!!