No, I guess EI is not really based on a ratio so it doesn't matter if you dose 10-10-10 ppm NPK. It could be pointed out that that would be way more P than is needed implying that there is some sort of aproximate ratio after all.


Your saying that there arn't ratios got me to thinking about what the ratios are in my tank and I understand now that I had deficiency inhibition not Ca inhibition.


I get a some N from the fish food, so I do need more K... it just doesn't make sence how much more though. I dose K like it is used more than any of the others, and if I back off I get holes in the older leaves.



I ran my cheap tests on my tap water. I don't fully understand the results, the tank gives evidence that Mg is rather low, ie growth slows unless I dose enough to bring levels up to a minimum 2 ppm



40-60 ppm Ca++ probably 40-50 as it almost changed at 40

120-140 ppm Gh

100-110 ppm Kh

This is Utah with a lake giveing evidence to the presence of other salts in the water, but it seems odd that that much is not Ca or Mg.