Thanks for replying. The chicks that have survived look very healthy. (unlike the 10 that we lost. They looked tough from the start). The temp is 95 under the lights, and I am giving them eletrolytes in their water. They have plenty of room in their 4'x4' brooder. I will get 15 replacements on Tuesday, so they will be just 1 week apart in age. My plan is to put a divider in the brooder for a few days, and then introduce them to each other. I hope that is ok? Our last chicks came to us in 2016 and every one of them survived. When I contacted the company this week, they said that the girls I got on Wednesday had started in Pennsylvania. That is two full days in a box in the mail. Seems like a long time to me, but my experience is pretty limited. Thanks for your input.