Personally, I would feed it at least a few different things. Switch from silversides, to raw shrimp, to clam, to rod's food, etc.
I feed my GBTA a finely chopped mixture of clam, squid, shrimp, tuna, scallop, and whatever other seafood I can get at the grocery store at the time. I chop a whole bunch up, and freeze it into 1/2" thick slabs. Then I break a chunk off, thaw it, and feed it to the anemone with a turkey baster. This is what I feed my sun coral as well.