I have 2 silkie chicks, 4 weeks old, and three other chicks (RIR, BO and BR) that are a little over 2 weeks old. They are sharing a brooder and we keep the heat around 85 or so now and on themall night. It has been in the 60s in the morning when I leave for work so I raise the heat lamp up a good bit. It's been the 80s by the time I get home. By the end of this week it will be in the 90s in the afternoon but still in the 60s in the morning. Should I just turn the heat lamp off entirely when I leave in the morning?