sorry for bugging everyone trying to id these things that came with my live rock but better safe than sorry.....ive got a beige hairy crab living in a crevice in my rock....it doesnt move much but does when i squirt some shrimp beside it.....ive been feeding it that way for a couple of weeks and it seems to be doing fine and doesnt seem to be bothering anything like the corals,shrimps and hermits i have in there.....so just wondering if it will be ok and wont turn into some fish eating monster overnight......thanks for the advice guys this site is awesome!