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RE: Aquatic Plants Digest V3 #61

On Sunday, February 01, 1998 3:48 PM, Aquatic Plants Digest 
[SMTP:Aquatic-Plants-Owner at actwin_com] wrote:
> From: Petemohan at aol_com
> Subject: Re: Aquatic Plants Digest V3 #59
> In a message dated 98-01-31 16:10:32 EST, Mark writes:
> << My 55g planted discus tank is doing quite well thanks in large part
>  >to information from this list.  It is doing so well, in fact, that is
>  >is
>  >using up nitrates faster than my fish can produce them.  As a matter of
>  >fact, my nitrates read zero with a Red Sea test kit. >>
> As Chetlen suspected in her reply to Mark, my experiences suggest that 
> KNO3 is a good way to dose extra nitrogen.  I'm using the "standard" PMDD
> formulation in our planted aquariums and have found that in my particular 
> up (150 gallon with lots of Amazon swords, Rotala, and Hygro with 2 175 
> 5500K MH lamps and CO2 ) nitrogen is used up very quickly and weekly 
> were often showing ~0 ppm.  I made up a second nutrient additive just
> containing the same concentration of KNO3 used in PMDD.  Right now I'm 
> equal amounts (5 ml) of the two solutions daily (doubling the original
> KNO3 dose) and this appears to have solved the problem.

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.


The very act of seeking sets something in motion to meet us;
something in the universe, or in the unconscious responds as if
to an invitation.  - Jean Shinoda Bolen