Last year I purchased a Otocinclus(obviously not a monster fish), It was a cute little fish. One day I noticed it was kinda fat, did research and they said it's supposed to be a little portly. Well ok. He ate my turtles poo for about 2 months. For the first month he was a little fat, but not bad. Then his tummy kept on getting bigger, and bigger, and bigger! He was deficating, so he wasn't "plugged". Then, one day, I found my poor little fish w/ his tummy open and quite dead. I thought maybe a tumor. But after he died and I saw in there, nothing. Didn't have another tank to separate him. So, has anyone had a fish eat itself to death?