They are just over a week old. They shipped last Wednesday (July 22nd) from McMurray. They arrived Thursday (the 23rd) afternoon. They are on non-medicated starter crumbles. They are inside the barn, light is on at night, off during the day (it gets too hot with it on in the day). I don't have a thermometer, but it is definitely warm enough but not too warm.
Last Friday I lost one pretty suddenly. Friday night another one was unthrifty. Saturday morning it was dead. They all seemed ok after that, until yesterday evening. One chick was rocked back onto his hocks, not standing. He could take one or two steps if I nudged him. His wings were splayed to the sides. This morning, one is dead, but the sick one is still there. So, either the sick one from last night died and another one got the same exact symptoms, or a seemingly-well chick dropped dead.