Originally Posted by ninjajim4
Just by way of update, unfortunately, you were correct. I thought the subsequent day that the bulging seemed less pronounced and I hoped there might be a chance at recovery, but the following morning this poor guy was floating.
Sorry to hear, sometimes I hate being right.
Did you happen to do an autopsy to see what was in there? Normally I don't either unless something is weird or off. Case in point, the fish in my avatar was going along just fine, breeding like a champ, then one day stopped eating, started bloating and eventually died. I did an autopsy and found a piece of gravel in his intestines that was blocking him causing an infection and eventual death. That piece of gravel came from a very small amount of gravel in the cup of a plastic plant to help weigh it down. How he managed to get THAT piece took real effort on his part. It was a shame his tenacity turned into stupidity and cost him his life but that's what can happen in the world of fish keeping.
If yours was also something eaten, it would help to know so it can be removed.