some of my chicks-that look fine-have been having foamy poops-They have been on med food since day 1. I change their bedding -paper towels right now-5 days old-1-2 times a day change their water everyday...there are 15 chicks in 1 brooder and 9 in another. There pretty good size brooders-in my bathroom heating lamps-snuggly bears etc...If I'm in there I can hear them exploiding their poopies out! bleah..Is this normal--they all seem to be eating and drinking normally...help