I am a new "chicken mom" and need advice from those of you with more experience. I bought 8 chicks (future layers), now 3.5 months old. All were thriving and growing until 3 days ago. I noticed 2 were lethargic, sitting alone, puffed up, not eating or drinking (or very little). I removed them immediately. The next day they were about the same, the feed store where I bought them recommended teramyacine in their water, but when I got home from work with the meds, they were already dead. I noticed one had poop which was not watery, but a dark red color and no white. After this I cleaned the ladder and perch in the main coop with bleach solution. They have a nice new coop, bedded with pine shavings. During the day they have free access to a dirt yard about 15x20 feet. I always rake their yard and change their water every morning. They have lay crumble to eat plus a treat every day (ie watermelon, greens, corn, etc. - always fresh, northing spoiled). Am I doing something wrong? Should I be doing something to protect the rest? Now another one looks not as "perky" as the rest, although she still pecks at food and is not puffed up. Thanks in advance!