I give mine pellets (what they can eat in about 1 minute) as a staple. About twice a week, I give mine a cube of brine shrimp. I have reason to put a 2/3 cube in (thawed of course), since I have 6 fish. They eat it quickly and love it.
I would recommend FormulaOne for the pellets. My fish LOVE them, and I would get the small kind.
I would feed the pellets about 2 or 3 times a day if you can, in small portions.
90 Gallon Reef - 3 Blue-Green Chromis, 2 Ocellaris Clowns, 1 Kole Tang, 1 Midas Blenny, 1 Longnose Hawkfish, 1 Zebra Dartfish, 1 Algae Blenny, 1 Six-Line Wrasse
29 Biocube Reef - 1 Chalk Bass, 2 Black and White Clownfish, 1 Yellow Watchman Goby, 1 Fire Goby