Thought I would share my experience...so far. I, like most reefers have been plagued with Asternia Stars by the hundreds. So I have tried the netting them off the back of the tank (6 foot long) and that is a temporary response to the issue. I needed to get something more permanent, so I got a Harlequin Shrimp (HS). They are absolutely fascinating to watch and have as part of a reef tank. I have two serpent starfish and they are unharmed by the HS. I did find out that when you 'try to add' a sand sifting starfish to the system - lunch is served.
These little guys must be incredibly strong for their size. They start out by getting on top of the star and the off to the side and actually flip it over. Appears that they only like to eat the feet. Mine has also fended off any fish that even comes close to the area of his starfish.
So here is a picture....hope no one is squeamish.

These little guys must be incredibly strong for their size. They start out by getting on top of the star and the off to the side and actually flip it over. Appears that they only like to eat the feet. Mine has also fended off any fish that even comes close to the area of his starfish.
So here is a picture....hope no one is squeamish.
