He's probably just fine. Just show's he eat's alot. If he swiming fine, no stress & seems happy, don't sweat it. Besides, if he did,{ I'm sure he didn't}, crap his insides out, you couldn't do much about it. It's not like your going to take him in for surgery. Sorry if it sounds Callused , but I've seen a 2" cromis crap 6+". Like I said if he looks fine, I would bet 100/1 that he is. Good luck, & keep us informed.
Rob