[CRAP! Another Hobby]

OK...bought 3 frags this weekend from a Calgary LFS...The frag tank they came from looked nice and clean. After getting the frags in our tank, I soon spotted a small white starfish coming out of a crack. It was less than the size of a dime. The other TWO frags each had some type of tentacles sticking out. They appear <1mm wide and have black bands and are responsive/interactive to touch.

Any ideas what the tentacles are from? Pest?

Is that cute little white starfish gunna be a pest?