Star fish is it's only source of food. I bought 10 chocolate chip starfish, I keep them in my sump. It seems that when he gets hungry he will come out and start swimming, floating around the tank. So when he does this I just cut of half an arm of the chocolate chip let him have it. Chocolate chips regenerat pretty fast so if you have about 8-10 then you should have a steady supply of food. I would do some research but this method has worked for me for about a year now. This would probably be the easiest way to keep the food supply. Or you could just just buy him a star a month if they are not to expensive were you live. Hope this helps