sorry for your loss, that sucks =[ I lost my peacock cichlid awhile ago (no clue why or how) and I raised it from out of its mom's mouth and it was special b/c the parents died when my tank spiked =[
Sorry to hear that man... when I saw the post, I was like.. wha?! You just posted in that irreplaceable fish thread and now this? Now I'm worried that one of my discus is gonna die or my marble goby or something...
Yeah.. thought I saw a front... the bite marks in the gut and stuff look like they probably came from a cichlid.. probably not the other firemouth or the oscars(they would have chewed him up more), but could be the front! The bichirs are certainly a possibility too though.. maybe you should hold a trial!