I picked up my first chicks at TSC yesterday. They are about 5 days old. One of the EEs was smaller than the others and had a bad pasty butt. After cleaning up yesterday she had a big -- normal-looking -- poop and started eating and drinking. This morning I saw her poop and it was basically diarrhea. I also saw her swallowing as if she had water in her throat (which she didn't), and a bubble came out of her mouth. Other than that she seems to be acting perky enough. No one else is having a problem as far as I can tell. They are on medicated starter and I'm cleaning out the water and changing the paper towels regularly. What should I do now? I am VERY anxious to keep anyone else from getting sick -- if she is sick -- as I have 17 day-olds coming in the mail this week and they'll be in the same brooder. On the other hand I don't want to go crazy medicating everyone if it's not warranted. Please advise! Should I isolate this chick to keep the others safe?