Read the post titled "All About Fertilizer" at the top of the general section. Theres a lot of info there along with suggested levels of nutrients. A shortage or overage of micros can also start an algae attack, so pay atention to those also.
FILSTAR Pimp #2
75 gal heavily planted,50/50 Black beauty,Eco-complete substrate, Pressurised CO2 with solenoid, ph controller, AB Reactor 1000, 330 watts 9325K GE PC lighting,Ehiem Liquidoser, 2-Filstar xp3 canisters.