I would go one further and keep him on the pea diet until his tummy goes back to normal size even if it is for a week. It will not hurt him and he needs to be back to total normal size before he goes back to any betta food. Then start him back very slowly as he will be very prone to constipation. And please no more shrimp. They are given baby brine shrimp for first food and so they see shrimp as DINNER.
Yes,

, he is a very naughty boy and don't tell him we are laughing! Tell him we are very upset that he did that. He needs to feel bad about it. Naughty little Cap!
Rose