The chick's bum needs to be kept cleaned off regularly to help prevent pasting over.Earlier this little one’s poop had blood mixed in with it. I don’t see that now. Cleaned off his bottom earlier with a warm cloth. Here is the last poop. Runny brown with white at the end. ) A few others are now watery diarrhea... I’ll try to attach pic too. I started giving the Corid. I hope that's what's wrong and not something else. (Also, I mixed up a gallon with the Corid... do I need to refrigerate it?)
How warm are you keeping the brooder?
How old is the chick?
If you saw blood in the poop, then I would continue with the treatment of Corid. If you mixed a gallon, yes I would put the extra in the fridge. It can be made in smaller batches if you wish.