I'm trying to get a handle on feeding a "healthy" amount fish. I've always been very cautious and kept PO4 at 0, but I haven't had many fish. I've recently stocked up. With more fish I noticed it's tough to get food to the more timid ones without over feeding. And some fish like my Sailfin Tang and Blonde Naso Tang go crazy and will almost eat 24/7. Seriously my Sailfin will keep eating even when he looks like he going to pop. Obviously the "only what they can eat in a few minutes" does not really work.
Stocking

About 3-4 inches:
Blonde Naso Tang
Sailfin Tang
Blue Hippo Tang
Copperband
Blue Jaw Trigger
Smaller:
sixline Wrasse
Firefish
2 percula clowns
2 blue/green Chromis
Diamond Watchman Goby
Green Mandarin
So I'd like some opinions. How much is enough with this many fish? A pinch of pellets (about 20) twice a day? 1, 2, or 3 cubes a day?
Obviously each fish is different - like Tangs need smaller amounts more regularly - I'm just looking for "in general."