water diarrhea

Hi my one chick keeps pooping a very dark almost black watery poop. Is he sick or is this normal? Attached is a picture

One of my hens seems to have a full crop. It's hard-ish and seems to feel like one of those stress balls with the rice in it. It's been like this for a while and I've tried massaging it and also tilting her upside down but nothing comes up. I don't want to hurt my hen. She's NOT losing...