One of my chicks is consistently having foul smelling poop. The smell is horrid and noticeable from a considerate distance (up to 2 yards away you can smell it). It is still brown, but is rather wet and runny (but it can still maintain its form, it isn't a puddle yet). The other chick is not having this problem, and no noticeable smells come from their feces. The chicks have been on medicated feed since hatching but recently we've stopped making their feed wet. The chicks are 16 days old and have presented no problems until now. Their brooder is at the appropriate temperature, and I am unsure of what is causing it. The chicks were hatched from eggs and have not had contact with other birds. Any solutions?