Oh yeah, they are definitely piggies! I love how it says on my food container to feed them as much as they can consume in a couple minutes. Umm mine would eat the WHOLE container in a couple minutes.lol One time my dad came in to check on my fish and they all started freaking out because they thought he was going to feed them and he goes "Jeez, they act like you never feed them."lol
Is his stomach bloated at all or does it seem like he's swallowed a small marble? Sometimes they can get bloated especially from being over fed. Thankfully if it's not too bad you can just fast him (not feed him) for a couple days until the bump goes down.