uh oh! what did I do?

[Flash]

I just got a few more pieces of LR from the local store... and in it there are a few bristle worms and a heckof a lot of what look like tiny bristle starfish....

are these goig to hurt my tank?! there is nothing in there now but a few small...hermits I can live with 3 bristle worms as my tank doesnt have any yet.... but are the starfish going to harm it? I have seen about 6 with the arm to arm span of about a penny!