Well my water is already pretty hard, I live in a city built on limestone.
There are several forms of Fe (iron). The two main chelated forms are EDTA and DTPA. The use of one or the other is influenced by PH. Plantex already contains the EDTA form. Augmenting this with DTPA will provide the best of both worlds essentially. So I would use DTPA iron in addition to the Plantex. No need to increase the dosage of all the micronutrients just for iron.
Assuming it's Ca(NO3)2.4H2O, the rise in GH is quite small and shouldn't have any negative impact on fauna, certainly not flora. If you add enough to raise NO3 to 7.5ppm, this will raise the GH by 0.34 degrees or 2.43ppm of Ca.
So DTPA iron in addition to the Plantex is all the micros I need?
I really dont want nor need GH to rise, in fact I need to lower it a little.
Forgive me, Im a freaking dosing newb.
My water is hard already and PH is never below 7-8 on its own.
My plants show signs of needing Potassium.
The goal seems simple enough? Buy dry ferts, dose as liquid form.
If all ferts are seperate, then I can increase or decrease any givin fert at one time...
I hope that I am not dreaming here??