Help. Last night temps went down to 35 degrees and I thought my chicks would be OK in the enclosed wooden coop with heat lamp as they are almost fully feathered. This morning one 6 week old chick was dead. (My single lacey wyandotte :-()The other chicks are lethargic and another chick looks close to death. The ill one has a blood stuff in its poop. I have just added the treatment for cocciatosis or whatever it's called to their drinking water but none of them are eating or drinking. All sleeping now (it is warm 60 degrees today) but not under the lamp. All huddled or sleeping along throughout the coop, some in corners. I have put in clean bedding throughout. They just seem lethargic. They have had no contact with the ground ever. I'm so worried I will lose more. Any advice?