Right now I use the Seachem line of plant ferts. I do however make my own nitrAte and potasium for my plants. The potasium helps turn the iron into a more useable form for the plants.
I do have a CO2 injection system on my tanks that is great. Add that to the mass amounts of ferts and what not I get a jungle in no time. I mainly use Flourish trace, Flourish iron, potasium, CO2 in my tanks. I have 110 watts on a 46g bow with Florite as my substrait. That and a lot of patience has finally won and I now have O2 bubbles on my plants in the afternoon. Fish have awesome color. When you get it all together and you look at your tank there's nothing more rewarding than that at night when it's just you and your tank.
Rose