Just thought I might share a bit of info that I have learned along the way. No amount of testing every got my plants to grow well.... I have chased that around for a long time.... hung up on ppm's and what this guy adds to his tank... and what that guy says is a good level for this.
I have found the most beautiful tanks are the ones run by people who could care less what there leves are and dose by what the plants are saying. I did this for a while in my tank and plant health wasn't to the point I wanted it to be however it was the best it had been in a LONG time... then I got away from it because I felt that i was adding to much of this or that.... and there was no way that my tank could need that much.
Well guess what the plants started to suffer.... but the test kits said levels were good. Lesson learned.... Im through with that, going back to trusting the plants.
I would recomend dosing a fairly balanced mix of all the nutrients your plants need.... if you still really feel that the test kit is right and you have high Phosphates.... then dose everything else N, K traces etc. and that will help the plants to use up the excess P....
At any rate what I'm trying to say is that don't get all to caught up in ppm values and what the "ideal" level is, and what you *think* your test kit is saying.... Tom has said it over and over, and it truly is a lesson to be learned and a skill to be aquired.... but
the plants don't lie.... its the best way to go about things