when its dead it will have puffy, cotton candy-like white stuff on it
Or nothing will be left. My brittle had nothing but a small center disk left. The C.C. still left it's body though.
Try spot feeding the star, raw shrimp or seaweed, anything. Maybe you can add whatever it is he eats from the sand, or get more lr to produce stuff or add some new sand? Just thinking here. Or is there anything you can add to make the ls produce stuff?
Nevermind, I see where you said what kind of star it is, I've never had one, so I don't know. But it can't hurt to try to spot feed it, could it?