that is a zoanthid spider if you go to zoaid they have some pics and info on them, if you have not put this frag in your tank i would definately do a freshwater dip on it to kill them i usually also dip in tropic marin pro coral cure good luck with those ive never seen one in person
its not uncommon to have pests come on new corals i would get some info on dipping all types of coral and always dip everything before you put anything in your tank no matter how reputable the person is you got it from.
Thanks for all your help
dipped the frag and put in display,didnt want to but did
now I keep lookin for those lil pests kinda scary huh!
Will dip everything from now on, Thanks again Bama.