The "no control" BS is almost worse than the previous claims it replaced. It is not "false" that you can control algae by limiting nutrients, but you have to define your system. Whether it is "reasonable" or "practicable" in your particular aquarium is an entirely different question that has now been lost in the new brain washing that it can't be done.
fwiw -I have a PhD and have worked on restoring thousands of acres of SAV using nutrient control practices.
Yes, you do have to define your system.
If you limit the plants, you will get algae.
Something will grow there and at very low nutrient levels, that will be algae.
Bachmann, Hoyer, and Crisman found no relationship between SAV, P, N and algae if a survey of over 300 lakes in subtropical Florida.
This would suggest that algae in the presence of SAV(generaly 30-50% or more coverage), is controlled not by nutrients, rather, that the SAV define the system.
If the SAV is limited(say below 50ppb P to 20ppb or so), then algae will dominate(down to 20ppb and below- out of range of the detection limits). SFWMD has a mandate for 10ppb for P which is rather tough to restore the Everglades.
The smaller the organism, the better it is at growing and competing at lower nutrient concetrations. This is normal marine pelagic ecology.
You can limit nutrients and limit algae I suppose using N and P in a planted tank, but your plants will suffer. Especially with N.
P, well, you can dramatic caes of increase O2 production when you add it and no net increase in algae.All you get is more aquatic weeds.
Algae need not be limited by nutrients, rather, light is perhaps the best solution as well as established healthy plants.
SFWMD for P references and algae vs SAV limitation ranges, and http://fishweb.ifas.ufl.edu/Bachmann/Bachmann.htm
Something else is controlling algae growth and it's likely the same thing we see in our aquariums, not P limitation.
Which is what Paul claimed.
But he did not bother to test it either.
You can limit algae, but it's rather though and simply put: not needed and does not focus on SAV needs. What SAV plants did you restore to their natural functional state and where?
Philips et al, 1978 was a popular P limiting paper, but they left out the fraction of P in the SAV but left in the P from the algae when they made their conclusions.
If you add the SAV P fraction back in, then there's no correlation, something the folks at IFAS and UF have long said.
I do agree limiting algae can be done, but it's not a good method for algae control.