Ok its nature video time.

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cool and educational.

I believe in the reefing world, they call them "pistol" shrimp. And they HAVE been known to destroy aquariums. (not kidding)

This is true. I used to be into salt water aquariums back in the 90's. You had to be careful that you didn't accidentally introduce a mantis shrimp via coral or rock where they often hide. I remember reading about cases where the little bastards actually cracked glass tanks.