Starfish okay?

[Keeks09]

I habe the white starfish and know they are okay but what about these gray ones?

 

[1MCp]

They are signs your tank is healthy, they aren't harmful

 

[KJ]

Asterina. Some varieties rumored to eat corals.
http://www.reefkeeping.com/issues/2004-06/ac/feature/

 

[GoVols]

If they are Asterina. I had the species that went after the base rocks coralline and were eating on my Zoa's.
In the mornings it looked like a small blizzard on the glass.

Bought a pair of Harlequin Shrimp and they got the job done but very hard to take them back to the local reef shop.