Feeding is one of those issues we each have to struggle with individually.
How much?
How often?
What?
Different fish have different needs in way of diet and frequency of eating habits.
Best thing to do is try different food, in different amounts and different frequency. Keep eye on nitrates and algae growth.
Eventually both you and your fish will establish a routine everyone is comfortable with.
I feed mine a food mixture twice a day. Evening and Night...corals get fed about mid day. What I find works best for my tank and mixture of critters.
No sense running a concentration camp and underfeeding nor overfeeding.
If fish are healthy and active and you are keeping low nitrates with little algae growth, you are doing right thing.
Don't forget those crabs and shrimp need to eat also!
"Om" 
"Reef on" 
Feeding Frequency 
