Hi King Puff, I actually use sand as a substrate. My tank happens to have a couple of small(ish) pebbles strewn around the tank from before I changed substrate (I didn't want to get rid of all the substrate hoping that some beneficial bacteria might transfer from gravel to sand). I got home today and noticed my cory was fine, he's been swimming normally with all the other corys and the swelling from his belly is gone. He is eating algae wafers and acting like nothing was wrong...Before I thought he swallowed a rock I did do a fairly large water change which might have stressed him out a little, but I do not know the cause of the previously swollen belly. Very weird. I will keep an eye on him incase there is something else wrong with him. I guess I had just assumed he'd swallowed a stone by the way he was acting and the look of his belly. The pebbles are small but differenciate in size, most of them look too big for his mouth but there might be a few tiny ones that he could have ingested...
Yeah, thanks!
