You may want to try a little meatier food. I get an ounce or 2 each of squidd, clam, mussels, shrimp and scallops. I mince it very fine in a food processor, add some selcon, zoecon and frozen cyclopeeze. Spread it on a sheet of aluminum foil about 1/4 " thick and freeze it. Then every other day i break a small chunk, thaw in a shotglass of tankwater and feed.
Works great and lasts a few months for less than $5. The other fish and inverts love it as well!