Well I've been suspicious for a little while. In some of my LR caves I see some empty snail shells and have been wondering about my pistol shrimp. Now today I see back in a cave my large hermit crab shell. The diameter of the shell was about the size of a quarter and the crab itself was pretty large. I'm not sure what else could have done this so I"m assuming my pistol is homicidal. Maybe it's time to get rid of him....or maybe I have a mantis hitchhicker I've never seen and assume the snapping is always from my pistol?