Alot of people say that a good stedy amount of fish poo is good.
You can also feed rotifers,oyster eegs and for supplements(if its all sps and no zoas) Amno Acids strip nutrients from the water which gives your acros great color,but zoas like nutrients and if striped of them they wont do very wel.
So IMO i think feeding the rotifers and good water changes you can keep sps and zoas with out needing AA's
I used ZOAS as an example because thats what im doing right now,and thats the little knowldge i have