A about 15 minutes ago I woke up to VERY loud cheeping (loud enough to wake me through my earplugs I sleep with) and saw one of the chicks flailing in the brooder. I thought it was our gimpy chick, but realized quickly that he was on the other side of the box and this was a previously normal chick. I picked him up and he was so weak he couldn't hold up his head. Less than 5 minutes later, he was dead. Upon inspection I noticed some light brown, foamy, liquidy poos in the brooder, there was no blood. When I went to bed everything was normal, all 8 were fine. They are eating chick starter (no idea if medicated) and drinking water with a small amount of sugar that is refreshed daily. They have a red bulb on one side of the box and can retreat to the other side if it is too warm. They are usually very active and all over the box. They sleep on the bulb side, but don't huddle directly under the bulb. Should I worry about the other chicks? Am I doing something wrong or is it just one of those things? I have Corid and Ivomec Eprinex on hand if either would be helpful.