I have 21 week old Amberlinks in the big coop out back and my little girls (7-10) week old Silkie and Silkie Cochin cross in the garage. I have had them for 4 weeks now and am planning on introducing them in the next week or 2. Im a bit concerned about the size difference, they seem so small compared to the big girls (and roo). Any advice on the introduction? ALso it is anywhere from 70 - 80s in the day and 40 - 60's at night. I know they are fully feathered but they seem so small we (I) still have the heat lamp on them...I know spoiling them..... Should i stop using the heat lamp or is it better to wait until they go into the big coop. Thanks!!!