I know nothing about that food, but I'd feed whatever they will eat, whatever they'll eat in a few minutes. I'd feed some meaty food for the clowns also. I feed 6/7 days, some people every other day, others twice a day. It really depends on your tank.
Tangs like to eat all day, so you may want to get some of the seaweed to put in the tang.
If you notice your nitrates go up, then you might need to feed less. Do you have a good clean up crew?