feeding starfish

What do you put additional in your tank to help feed the corals? I have a duncan and a pulsing xenia (I think that is how you spell it haha). Any links to products would be helpful! Also...I have a sand shifting starfish....I never see him...how do I know he is doing ok?

I've read countless articles discussing how Red Fromia starfish are prone to starving to death in home aquariums. I wanted to share with the community the success I've had feeding these starfish powdered Polyp Lab Reef Roids, as a means of supplementing their diet. My approach is to first turn...