So I noticed I had a few large dead ramshorn shells lying around in one of my tanks that houses Micro Crabs. So picking up one shell I never gave thought of anything in it until a leg popped out at me :nilly:. It was creepy cause it kinda looked like it wanted to grab you and it went back into the shell. I placed tiny terra cotta pots also in the tank but the crabs don't seem to like them as caves. So if you have micro crabs and have pretty big pest snail shells, better check them!