I went out to check for eggs this morning (20 1/2 weeks, still no eggs!) and it looked like there had been some kind of scuffel in the coop last night. The water and the food had been tipped over and the shavings were all moved around. I took a quick headcount and everyone is present and accounted for. No one seems to have any injuries or issues like that, but a couple of the girls are sneezinng! I live in Northern CA and the nights are only getting down to around 50 degrees. Do they need a heat lamp? I have some Terramycin. Should I go ahead and put that in their water? I don't have the original packaging anymore. How much should I use per gallon? Help me please!