Question for the experts. So I have a coop that is fairly insulated with my 5, 8 week old baby chicks in there. Lately it is starting to get cold...just looked into the coop and the temp is 56 I do still have a brooder lamp in there so if they get too cold they can get under it. Also I am assuming night was colder. probably in 40s. Do I need to provide any more heat for them at this age? Any info is greatly appreciated.