I don’t really know if that ratio is 100% accurateOnce you raise nitrates (and you should go very slow and test) the higher nitrates should lower phosphates a bit. Just go slow
Nitrates should be much highter than phosphates. Ratio of N to P should be like 30 to 150 they say.
so if I have 30ppm nitrates , I should have 0.9 ppm phosphates ?
I try keeping my phosphates around .03-.05 and nitrates 5- 15