I've tried numerous PO4/NO3 combo's to induce GW. Never was able to.
Went from 1.8ppm PO4 to 75ppm of NO3 to zero ppm.
CO2 encourages algae as well, GW in particular...............
They prefer CO2 also..........
I'd suggest a UV, micron filtratiuon also works, a 5 micron 9 3/4" cartiage and filter are cheap and locally available.
Then you can sell the UV later.
But more to the point.........NH4 is very bad and there's something wrong if you ever measure any in a planted tank.
That's what you add to induce GW FYI.
You will not beat GW by adjusting the NO3/PO4.
You are totally welcomed, even encouraged to try
But when you realize it does not work, perhaops you will try a UV or micron filtration.
Some have water changed the GW out, some have torn theiur tank down and set the plants in a bag and bombed the tank with H2O2, then refilled it, then added the plants back.
But you still have NH4 and you need good cycling so add mulm from an established tank to the gravel and to the filter afterwatrds or on any new tank.
Another method to get rid of GW, add lots more plants, floaters etc.
Then remove and return other plants back.
This is hiow I deal with GW in ponds, no need for a UV there either.
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