well i just recieved a free rock with really large exenia colony on it from one of my friends at a LFS. when i got it home i noticed a star fish on it, so i shook it off in he bucket, then 3 more fell out. so i kept shaking it to make shure theres no more.put it in tank after acclimating it and one fell of again and went into my rock work... it is about and inch all around,black, skinny arm, the arms look like this ++++++++ with little lines crossing over the arms. i dont like star fish in the first place, i think there ugly. and i know some are snail and hermit killers also.. and if its a bad one.. no clue how im gona catch that booger.

anyone know what kind?(sorry no pictures)