Tube anemoe on zoa frag?

I bought a small rasta zoa frag at the LFS yesterday and today notice what looks like a small tube anemone (rather long tentacles, can't quite tell where they're coming from - the site won't let me upload a photo to my gallery).

I just want to ask whether or not that could be harmful to my zoa. I'd really hate to spend all that $$$ on a frag only to have it get killed/hurt/etc.

Thanks.