Help identify. Astrea?
 

Can anyone idenitify please.

hard to tell from the pic. what color is the shell?

Looks black and 3 sided not like google pictures of asterina star.

Your picture is way too blurry to properly ID.

I'll try to get a better picture up later today. Thanks.

Here's another picture I had on my phone

Yes, that looks like an asterina star.

They can be bad or not, it seems. Some apparently eat corals and others do not. And if there is one, there are almost certainly more. Harlequin shrimp eat starfish exclusively, so if you want to get rid of it you could use one. However, it will starve once they are gone.

Yea I might not risk it and take it out it looks to be just one. I have mostly zoas don't want it to eat or mess with.

Thanks for the advice