This is actually quite good tap water.
GH booster for more Ca/Mg
Maybe 1-2 teaspoon per 50 gal after water change.
There is no optimal ppm for things, only a "range".
This is what I wrote about 15 years ago but have since raised some values:
Nitrate (NO3) 10ppm-30ppm Add KNO3 (Potassium nitrate) a.k.a. stump remover. Fish load and feedings.
GH 2-8 degrees Add Sea Chem's Equilibrium to raise. Or CaCO3 for both KH and GH.
Iron (Fe) 0.2ppm to 0.7ppm+ Add fertilizer such as TMG or Sera or Kent etc.
Phosphate (PO4) 2ppm to 5ppm Add K2PO4 or fish food or sometimes in the tap water already.
Potassium(K+) 20-30ppm Add K2SO4 and/or KNO3 to boost if you also need NO3. Also in Equilibrium/TMG/Kent etc.
If any thing is over these recommend levels do a water change to lower it.
Temperature: 68 to 84 F and a target of 76 to 78 degrees F or 25 C
Water flow: 5-15 times tank volume per hour (good ripple but not break the water's surface)
Fish load: Light to moderate/algae eaters should be added. Snails are good for this(pond, MTS, Ramshorn)
Lighting: 2w/gal FL,MH or PC's, 1.5w/gal T5 max, LED 3w crees: 1 w/gal max.
Suggested test kits:
Pinpoint pH monitor(much better)
Red Sea low range(cheaper)
Most all test kits are decent such as Tetra/Sera etc.
Lamott are the best
Same as KH
Sera or SeaChem(cheaper)
If these parameters are in a good range you should have only minor issues, if that. You only need light, CO2 nutrients and a balance of these factors and of course a little patience and an eye/desire for the planted tank!
Use known standards for references, otherwise, do not even bother test, as the result will be unreliable.
You are just guessing if you do not use reference standards FYI. So tedsting is a waste of time therefore if this step is not done.