I have a 1 year old BB Red rooster. He’s just hunched up and not really moving around. I noticed this last week so I isolated him and noticed his crop was full and hard like a golf ball. The next day it was smaller and squishy. That afternoon it was empty. He was drinking the probiotic/electrolyte water I was giving him and was back to normal after 2-3 days. As soon as I fed him again (laying crumbles only) he went right back to being hunched up and not moving. I have him isolated again. Any ideas what’s wrong?