Thanks Tom & Brian

But I still have a couple questions.
With my GH at 8 and my KH at 5.5, would I still want to add a GH booster?
You said that there is no need for K2S04 which is Potassium right? If I stop adding this, where does the potassium come from?

My reasoning of Iron/Magnesium/Calcium (from the top post here) came from Chucks site and another one somewhere.

Joe