I have 7 chicks. Picked them up from Ideal Monday. They get medicated starter and plain water. They are on paper towels over pine shavings. I change their water several times a day. I change paper towels several times a day. Temp ranges from 90 -100 in the brooder. They seem happy - milling around. No one is showing any overt signs of illness behaviorly - yet. Do I administer plain yogurt? Could this be from the temp dropping too low sometimes? I just saw it was at 89. I lowered the heat lamp. Help. I want to nip this in the butt. I love these little girls!