Hmmm, harlequin shrimp have been known to feast on the tube feet of sea urchins too. But since featherstars lack such tube feet, I doubt the shrimps will eat them. Anyway, featherstars themselves are impossible to keep in captivity unless you have a constant supply of fresh natural seawater that is laden with zooplankton prey.
Lots of sea stars arrived at Iwarna yesterday. Orangey red ones though.