Death

I had a death today. A platty, was acting a little weird, waiting around at the top with a large stomach etc. Died and is floating on its side. If turn it over in the water, it turns back onto the side it was floating on, like it's top heavy. on the "top heavy" side, there is what looks like a tumour bulging out. Its anus is open and the rim is white. Possible constipation...? Will try and upload photos.

Here is the "tumour" I think it could be a bulging belly?