Any ideas?

[czlock]

Any idea what this is? It is only about a quarter of an inch big.

 

[BL1]

Looks like an asterina star to me, I pluck them out whenever I see them in my tank.

 

[Smitty]

+1 Brian...just an asterina star...I have about a dozen in my tank.

 

[sen5241b]

1+ Yep asterina star fish. They will eat your coralline and reach pest proportions. I agressively pick them out with tweezers. Now I see about one every two months and pick it out immeidately..