NICE!! I feed my serpent and brittle stars pieces of shrimp and silversides once or twice per week, when I feed my anemones.
If I don't, they will try to take the food from the anemone, and I try not to let that happen. The serpent will come and take food out of my hand, but not the brittle...have to feed the tentacles(that's all I ever see) on a stick. I wouldn't expect the serpent to start catching fish for food, although it wouldn't be totally unheard of. Usually only the green brittle, but...