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.
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.
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