Chromis killed

[Lofus]

I've got a 72gal FOWLR tank that I am currently stocking. I purchased a brittle starfish a few months ago and I suspect that he cought and killed one of the three chromis in the tank.

I was looking in the tank this evening and saw the starfish and three of my hermit crabs munching on him.

Is there anything I can do to prevent another one being eaten? Should I extract the starfish or is there something I could feed him to keep him from hunting?

Jim