Probable mantis shrimp

[Robb1821i]

So I came home to find this today. Wondering if anything but a mantis can do this. I have all live rock and clicking sounds at times, but I know there's at least one pistol somewhere in there.

 

[vetteguy53081]

Mantis can do this very easily
They have a claw that is like jackhammer. If you have one, you will likely hear clicking like the sound of a cap gun

 

[Robb1821i]

I've had pistol and mantis in the past... never was good at telling their sounds apart.