need help id'ing

[jjdanielson]

I have found 4 small hitchhikers on my live rock. They are very small the diameter of a pencil head eraser. They seem to have a starfish form; but they are asymmetric. One side has three longer arms land the other side noticeably shorter. On the side with the longer arms, the middle one is the longest. The arms themselves are in the style of a cushion star. What is it?

 

[meowzer]

sounds like asterina stars....they are harmless....don't get very big, and will multiply based on available nutrients