Mine poop like that all the time, and I have 6 mysteries. I’ve noticed it seems to be lightest when they’re running out of things to eat.A. Rozhin said:I had a snail do that recently, and it died the next day. I've never seen a snail poop that much at once. Mine was a nerite, but it looks like that, just white stringy junk. Make sure you check it occasionally, they can muck up a tank quickly once they die (and I hope yours lives, that's a gorgeous one).