I was told there is real no all in one fert mix but they have a macro/micro mix that claims to be near that.
I would advise against getting an all in one fertilizer mix. As you are already aware, there cannot really be a "one size fits all" fertilization solution for different sized aquariums. There are just too many factors to account for from aquarium to aquarium.
Getting separate chemicals is the best way, since it offers the highest degree of customizability. Of course, it may be a little more difficult to work with at first, but you will soon get the hang of it.
Also the difference between po3 and po4 confuses me. They are both potasium so why do they sell them seperate?
I am not sure where you are getting PO3 and PO4 from. In addition, these are not potassium, but phosphorus (in the form of phosphates, namely PO4).
I'm basically asking what dry frets do I need?
Potassium nitrate, potassium phosphate, a trace mix (such as CSM+B) and a GH booster (which is just a mix of calcium, magnesium and potassium sulfate) are generally recommended.
The GH booster can be omitted if you do not have a need to remineralize your water. If you buy the sulfates separately, you can mix your own. Of course, having the potassium sulfate separately also affords you the opportunity to dose potassium alone in case you notice a potassium deficiency in your plants.
Anyone have input?
Friday evening. Be patient.