RadaR
The things we do for our fish..
I'm already using Seachem Flourish.
So basically the macro nutrients I'm missing is just Nitrogen and Phosphorus? Or are there others I need? I know that Big Als (the website I linked) stocks most, if not all, of the seachem products.
Well AFAIK there is NPK for the major macro nutrients though you could in theory believe Calcium, Iron and some other elements fall into the category of Macro due to their uptake in comparison to the Micro nutrients.
No. Plants need NPK soooo much more than any trace element. If I remember correctly, very roughly, plants need nitrogen 50 times more than iron. Saw it somewhere on UKAPS.