Never heard of a rock shrimp in my life, sounds like common name BS to me.  Did you see this at an LFS? Could it be a mantis shrimp?
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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