I watched my Delhezi swallow a rock when i had gravel but he must have spit it or ***** it...So i switched to sand but didn't get every rock and roughly 4-5 remained when i added the sand....Now what are the odds of one eating one of 4 small river rocks left? Well my dumb Senegal did which was 4 inches at the time but he is fine today? My guess they were small and rounded enought to eject..The recent pic shown on this forum with the bichir cut open were sharp edged rockes which probably enlarged into tissue and got stuck? I don't know but Bare bottom or a sand no larger than pool filter sand is best for these buggers!

). i think the death of the bichir is like a kick in the nuts...IMO