B Betta132 New member Feb 13, 2015 #2 The claws look like bad news. Put it in a refugium or sump and keep an eye on it.
Calappidae Harlequin Shrimp Feb 13, 2015 #3 It's a type of clown crab. Xanthid species. They are coral and oppertunistic fish predators.
Z Zaccolwlell New member Feb 13, 2015 #4 That's not good, I just found 2 of them in some live rock. Real small, possible eggs hatching?