I read you only need one chocolate chip star to feed one shrimp. The legs "should" grow back fast enough to keep up.If memory serves, harlequins don't eat brittle and serpent stars, which is good as I have 4 very large brittle stars. They do, however, eat pretty much any other star they come across. I'll need to figure out what to do with my Linkia <insert sad face here>. I'll also need to get about 4 or 5 chocolate chips to keep in the sump for when the harlequin runs out of food.