Found a 2 week old chick dead unexpectedly. It was acting normal a few hours before. There was a bit of runny black poop splattered in his box but no other signs. We have 1 other chick in with him who seems to be fine also, but worried he will die unexpectedly too. He did poop a bit of runny black poop this morning. The the photo makes it look red, but it is more brown. I thought they were on medicated feed, but they were not. Just switch this guy to medicated feed last night and put nutri drench in his water.