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Re: Aquatic Plants Digest V3 #65
> A note of caution:
> I went through much the same experience and for a time used the same
> solution - dosing the PMDD sample recipe according to the results of my
> iron tests and then adding KNO3 as required to keep the nitrate level >0.
> When first I began this I too saw obvious improvement for time.
> Eventually however things took a turn for the worse again - the tanks had
> become K limited.
> My current approach is to split the PMDD recipe in half. I have a solution
> with the trace element mix and MgSO4 in it and dose this as required to
> keep my iron test happy. I have a second solution with KNO3 and K2SO4 and
> dose this as required to keep my nitrate test happy.
> This seems to work better for me.
Wait, I don't quite follow. If the problem is that by adding NO3 you
cause your tanks to become K limited, then don't you need to be able to
dose K and NO3 seperately? That is, shouldn't KNO3 and K2SO4 be in
different solutions? If they're not, then what have you changed?