Well I know I've listed this before but I feed several different types of food and my fish look like they love me for it.
I cycle through the following foods, but I only feed my tank 3-4 times per week.
HBH Supersoft
Omega One Marine Flake
Cyclopeeze Flake
Cyclopeeze Frozen
Frozen Mysis
Frozen Brine
Ocean Nutrition Formula One Frozen
Ocean Nutrition Prime Reef Frozen
Ocean Nutrtion Prime Reef Flake
Kent Marine Phyto
Kent Marine ZooMax
Ocean Nutrtion Seaweed Selects
Julian Sprung Purple Seaweed Sheets
How's that for a menu?
Feed a variety, you'll find one they like, and then they'll be more accepting of any food you give them. Before I feed I soak all of my foods in RO water, and occasionally Garlic Xtreme.