DT's, rotifers, cyclopese and other planktonic foods can all work. You need to feed it while the polyps are out. You can use a syringe or eye dropper to target feed it. Be sure to turn your powerheads off while you do. They need to be fed regularly.
I have a strong flow in my DT I feed my animals 1 cube of frozen shrimp,or other frozen foods in rotation and daily, will this provide ample food for the Gorgonian ?