Thanks for the link, I haven't been there in a while.
It's interesting that some of their labels contain less and less as time goes on, the two generations of AB I have only say no P. I wish they provided more info, they have some of the best products available.
From the MSDS, AB's decomposition temp is 270C, SG is 2.16, both identical to NaHCO3, tastes the same, too.
I kept an ancient tub of Equilibrium that has composition listed (doesn't now):
trace Fe and Mn, too.
Replenish, from the label:
Don't think my Na idea flies, the amount in AB ( I use 1/8 tsp in 3 gal of RO) seems to be about 10x the amount in Replenish, if I did the molar stuff right, been a while.
K is minute in Replenish, I started the transition with pwc's from Equilibrium a month or so ago, although I can't find any definitive K deficiency pics of water sprite roots, it sort of makes sense that K has been gradually being used up.
Looking at Ecology of the Planted Aquarium, pg 87, and doing a rough estimate of what is recommended, it seems Equilibrium is high on K for the GH's I was setting (all the extra maintenance beforehand) and I may have hit a general sweet spot during the transition a few weeks ago when suddenly everything looked amazingly good, since the root problem seemed to become visible recently.
I'm going to try to replicate Diana W.'s recommendations and then can fine tune as suggested by our Diana a few posts ago.
Meanwhile, adding back some Equilibrium seems to have improved the floater issue already, so that will continue. I just don't want them dying off before the right stuff can be made up, took too long to get going and they do a heck of a lot for the tanks!
Sorry for the long post and numbers, thanks for spurring thought.