Thank you very much for the comparisons. How much more PO4 would you suggest adding for starters? I was quite surprised at the low amount of PO4 to be added in relation to the other minerals.
I dose 5ppm 3x a week, of course as stated, this is non limiting.....but also does not harm, but I seem to be able to grow more species and have larger crowns and better plants than many.
The target is about 0.1ppm for PPS, which is the same as PMDD 8 years before it.
Some do not like GSA which is associated with lower PO4. Some folks add PO4 and get BBA, this is because the CO2 was limiting. If they limited PO4 stronger than the CO2....then they do not get BBA.
Still, the issue was the PO4 and CO2 are not independent, so when non limiting PO4 is added, it highlights their methods and shows they have inadequate CO2. Some do not wish to resolve that horticultural issue, instead, they want to "believe" it's the PO4 fault.
The falsification of this "belief" is the fact I and many others dose PO4 in the 2-5ppm range often........without BBA and have good CO2.
I would add enough PO4 to target at least .4ppm per dose. Maybe more.
My own tanks:
I've sold a few thousand dollar's worth of Starougyne , bred 6 species......raised many shrimp etc in this tank, no algae in 5+ years now.
Pretty simple approach.
I would suggest you read this also for daily dosing:
Do not mix Fe and PO4 together in solution.
I tend to tell folks to focus more on usign LESS light and careful metered control of CO2, then..........they can easily work with nutrients without dependent factors.
Then nutrients are pretty easy.
A good article there on light/CO2:
Read those two really carefully and well, make sure you understand the figures.