Both methods, as well as ADA's, PMDD, have ample K+.
I think I mentioned to the author that these things would never work for control, but folks still try every sort of snake oil known
Somethings folks have to learn the hard way no matter what you tell them.
Plants define the system, not the system defining plants, as long as they have enough light, CO2 and nutrients to grow.
Algae are a bit like annual weeds and the aquatic plants are bit more like perennials. The spores look for good chances of growth to adulthood and release more spores. They do not live long. Plants can live via clones for hundreds of years, thousands even.
Algae just need a good germination signal to grow and then they are off.
Learn how to grow plants well, focus on their needs, not killing algae, that's not the hobby you signed up for was it?
So focus on plant needs and growth.
Regards,
Tom Barr