I had a turbo snail that died and I figured I would leave it in the tank for the hermits, I went to move it out of the middle of the sand and when I picked it up, slime oozed out of it and was quickly broken up all of the water making a nice snack for my angel. So i guess it was dead snail remains, but the worst part of it is it made the water smell horrible for a few hours. So maybe it was just me, but the next time a snail dies, I will take it out, clean out the shell the put it back.