My rooster suddenly has become lethargic and acting strange, not interacting with the flock and when he does get too close the older Rooster will go after him. Which most people say isn't unusual, however I don't usually have that kind of issue with them, the younger rooster knows his place. He just stands in place for a long time then moves very slowly. He is drinking a lot of water and not eating too much. He's usually the first to the food/treat bowl when I set it out, but he pecked a little bit this morning but not much. He's all poofy around the neck area, I don't see any cuts or bleeding and he doesn't seem to have trouble breathing. His comb isn't very bright red like the others.
He is squirting out very watery poop. The other three don't seem to have any issues. I looked up symptoms and crop or sour crop or crop impact come up, but honestly, I'm not sure I can get a hold of him to check. Any insight would be appreciated!