Honestly, I'm not sure from the pic (blurry) what species that is. It could be H. aurora, but it looks badly bleached whatever it is. It will probably eat small 1/4 inch cubes of silversides, squid, or shrimp (uncooked table shrimp). It would benefit from being fed several times per week, assuming it will eat. Put a piece of food on the tentacles and watch to see if it takes it into its mouth. Also, what type of lighting do you have (watts, color temp)?