I believe some need more than others, but I've always been told/read that they all need it large or dwarf. I've always fed mine food with sponge in it and have excellent results. My Coral Beauty is a little fatty!
I do not feed pellets or flakes, don't like them and think a lot is wasted.
This is what I feed:
SanFrancisco Bay Brand Emerald Entree and Marine Cuisine 1cube 2x a day (marine cuisine is new, I used to only feed EE 2x a day, now we're doing 1/2 a cube of each a day)
PE Mysis - night
Reef Nutrition ArtiPods - morning
Spirulina Brine Shrimp
Squid (also new so no measurement yet, trying to see if the fish like it)
Live Baby Brine 2x a month
all food gets Boyd's VitaChem for Saltwater added to it (which has sponge extract in it as well)
Also, there is always a 3"x3" strip of each in my tank:
Ocean Nutrition Brown Algae Sheets with added garlic extract
Ocean Nutrition Red Algae Sheets with added garlic extract
I have 17 fish in my tank right now though (two dwarfs)