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A foot long?! Wow... Be glad that you didn't get hit by one that big!
I'd just like to note that small smashed snails, clicking noises, and torn-apart small crustaceans can indicate that you have a very large pistol shrimp. It's not likely, but a big hungry pistol can do a lot of damage.
If you hear just snap-snapping noises without any damage, but they're rather frequent and you can't spot a source, you may have a pistol shrimp. Check for tunnels.. Pistol shrimp are not only usually harmless (only huge ones can kill things),but they're interesting and make great little community critters when paired with a nice shrimpgoby.
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