the peas can make him poop like that. They poop what ever color they are eating and the peas will make it wet poop looking like diarrhea plus he is stress out. give him some time
Layena makes my ducks have runny and smelly watered poo, and ever time I give them was or veggies, it turns green. So the poo doesn't sound top concerning. The lack of eating is a concern, but he could just be tired, or stressed. Try leaving him in solitary, and adding vitamins to his water.