Tom would the amount of weekly GH booster change based off of the GH of the source water. For example, if the GH of the source water is 7 would you only dose a small amount of GH booster compared to RO water with a GH of 0? Then if you are adding GH booster you would not include Mg in your macro dosing (I think this is what the OP is asking) Is there a range of Ca or Mg you'd recommend? Also in the case of RO water what is best to set KH at?
I generally add it either way, 1-2 degrees ain;t gonna make much difference if it's high and sometimes the GH is all Ca++, so the extra Mg helps, you can look at the local tap water report to make the call, sometimes just MgSO4, and that can be added to the trace mix. CaSO4 is you are low on that, but I've never seen a place that was high on Mg and low on Ca++.
So you can add it either way or modify to suit your local conditions. EI is all about adding a bit more than you actually "need". But not going too far overboard either, no need to waste some either and lard it on, but doing so........does no harm either.
Overtime, most folks realize this.
Those who do not, are still doing it wrong.
Sometimes folks overlook some thing and that gets them. 10 years later they figure it out. Some get it from day 1.
KH/GH is low here, I generally add another 1 degree or a bit more for GH. I do not adjust KH. If you add KGH, 1 degree is plenty and only if you use pure ROetc, but there's no good reason to do that either. Just blend the tap with the RO to target 1-4 dKH.
No need to dose baking soda etc then.
Do you just make up the quart of Equilibrium they recommend and dose your tank from there or do you just dose it dry? I have been having problems with my KH and GH being low causing mini cycles. I've dosed Baking Soda which has helped and bought the Equilibrium but haven't yet dosed it.
Dry dose. GH booster is cheaper than SeaChem.
I add about 1 TABLE spoon per 60 Gallon of tank 1-2x a week of GH booster. This meets all plant species requirements for optimal growth with low KH and good light, care, CO2, ADA aqua soil, algae eaters etc.
Ferts are EASY, CO2, good habits, general care, consistency, not so much.