Depends. Right now I only have four fish in my 180g system. I like to disperse foods into the tank that my fish may not necessarily be able to eat, one is a homemade style food. They'll get chunks here and there but the rest is very fine.
I don't think I feed enough pellets to sustain my corals, if I did my fish might explode!
Every system is different, in many cases just feeding the fish is plenty. Ideally, use a food that has plenty of chunks for your fish and also has 10-150 micron food particles in it. Use this maybe a couple times a week in place of pellets.