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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?