Definitely a pistol shrimp. It's easy to miss them as they can be quite cryptic. He may be small or have a burrow at the back of your tank. I see dozens of them on good live rock shipments all the time. They're harmless. If it's a species that gets bigger, you may be able to match him to a goby when he gets bigger.
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AI Man
James
Aquarium Illusions
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