Thanks for the post Tom as always a wealth of good information. By and large my situation is tuned to where I am happy with it. You've shared this information a couple times in the past and indeed I made note of it. Simply answering the OP question here and offering the information I have on file from prior to the site shutting down where Edward hosted his systems.
Edward obviously took this stuff from the APD and the Krib.
Folk's had long long been doing PMDD for 8-9 years before Edward supposedly invented any of this. A cohort of newbies came along and thought it was great and had no clue where the info came from. Too much so to say it's a mere coincidence. No one has step up to defend this. APD posters and Paul no longer post much.
PMDD worked well for many folks, but was strongly PO4 limiting, which was the goal for that hypothesis, which was falsified, but that did not imply it does not grow plants or that those ranges where bad for plants, they where just lean/moderately limiting.
Plants STILL grow however.
Edward went after water changes for his argument for support.
The horrible, the evil water change.
EI went after non limiting conditions and the evil, the horrible test kits.
Both methods still dose the same things however.
And both can be reduced or increased to suit either goal there.
Both could use test kits....or not.
I am not one dimensional regarding plants, I know more about CO2 and light for management. As well as yourself, a nice fish load. I still love me some fish!
Avoiding the impurities from the well and subjecting the salt regen house RO water to RO membrane final treatments provides me a quality supply for my tanks.
Often times, KH is about it, some want less KH is all. The others? Activated carbon is more economical, no waste water and simple to use.
If you use a well, it cost $ to run the well pump and drive the pressure against the RO membrane, you are paying for that. And a 1/10 ratio is a typical RO efficiency production. So 1000 gal will produce 100 Gal of RO water.
A few small tanks? Not an issue though.
Also while I have a system following the D. Walstad type maintenance schedule the remaining tanks are merely pushed out to ruffly 3-4 week intervals on the change schedules.
This is all I do for 3 tanks I have
One water change a month.
I just used less light, good CO2, high fish load, and slightly reduced dosing.
Bred quite a few fish and CRS SS grades etc.
Parameters of NO3 10-30ppm, PO4 1-5ppm, maintaining 4-6dGH and 2dKH my plants grow, fish breed and I'm happy with the tanks. Enriched substrates, dosing trace along with Fe and monitoring TDS levels the schedule is one I can maintain along with my job which includes crazy hours from time to time along with family life.
Yep, good management there.
Bonus for me was deciding only two tanks needed to be in overdrive with high light and CO2 for me to be happy. Took a couple of years to get my understanding and expectations in line but things are fairly close these days.
I'm about the same, 5 tank limit, 2 are semi fast growth, the light is still low however.
I can wait 2-3 weeks to trim the stems vs weekly.
BTW, wood went out.