Additives?

[BMahura]

Hey everybody
I have had my tank for 10 months now and its been running very well. however i havent been dosing my system with any additives. Some of my coral is somewhat dull in color especially my acans and i feel that i could do something to increase my coral colors and growth. What types of additives should i be adding to my tank.
I have a 60 gallon tank with a 30 gallon sump.
As far as corals go i have an assortment of mushrooms, GSP, zoas, Kenya tree, Xenia, candy cane, frog spawn as well as others.
Any help would be great

Thanks.
Brett