My tank has been infested with asterina stars. I have been looking for a Harlequin Shrimp with no luck. Someone posted that one could freeze asterina stars to make sure you always have a supply to feed when I find one. Would anyone give me a few hints on how to keep a Harlequin without having to feed it pieces of live starfish once it goes through the ones in my tank? Also, has anyone seen one for sale on line? I would so appreciate help.