They can easily pierce or smash (depending on type) snails and crustaceans. In some cases, they've been rumored to break aquarium glass, and some that haven't have a possibility to. Anyways, point being, if you have snails and crustaceans, and you like them, get rid of these shrimp.  Many LFS will take them, and they're interesting, so if you've got a small nano tank you'd like to keep them in, they're supposed to be quite neat.
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125 gallon saltwater: 55gal sump, 4 Blue-Green Chromis, Purple Tang, True Perc, Firefish, Royal Gramma, 5 Ricordea, Bubble Coral, 15 Pulsing Xenia, Green Star Polyps, Deresa clam, Green-Tip Torch Coral (about 11 "heads"!), Orange Montipora Cap, Purple M. Digitata, Green Slimer Acro. Yongei, 3 Orange M. Digitata, Pink&Green Acro. Millepora
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