So my day olds are supposed to be coming home tomorrow and the brooder is set up with pine chip base and I made a heating pad cave as close as possible to the instructions I found in Blooie's post. I've tested it and the temp under my cave is only reaching 86-88. Will the chicks be able to handle this? There will be 12 of them. Planning to keep them inside, too, until our coop is ready. Thank you!!