I don't feed them at all - they eat on their own.
I have an orange star and a red star that cruise around the tank eating algae off the substrate and glass.
I have two green serpent stars that eat right out of my hand.
I have one tiger striped serpent star that hides most of the time and I have one brown brittle star that I never see.
Sixe in one tank - it's fun
remember your tank must be at least 6-10 months old for the orange/red stars - but serpent's will eat what you feed your fish.
the other cool thing about serpents - if one of your fish dies - they'll eat it before your ammonia spikes!!