I live in S FL and would like to move about 20 babies out ASAP...however when I do move them out they will be sharing a coop with 8 older girls...at what age can everyone meet? Also, as long as they are enclosed in the coop at night, do I need to figure out how to keep a heat lamp in there too? It's been in the 60-50s at night, but the coop is fairly small....suggestions for the whole process? Also, when can i start taking them outside during the day...they arrive on Monday. This it the first time i'm raising babies, I've always left it to the chicken mommies...