I just got a cleaner shrimp yesterday and today, my red knob starfish is eating it. $30 meal for a starfish... awesome. I totally forgot that they love shrimp. I guess I learned that lesson the hard waywhen i had a chocolate chip star, i feed him thawed frozen brine shrimp/mysis shrimp. he would come to the top of the tank every morning and bend at arm back so i could basically plop some right down near his stomach for him to digest.
i have 2 ch. starfish...and i don't target feed them..they just feed themselves on any falling food that hits the bottom of the tank...they can pretty much take care of themselves..but i guess you can hand feed them..