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Re: [APD] High NO3 reading

Maybe a lack of something else is limiting nitorgen uptake?
Thus, "high" nitrate readings but plants that appear to not
be getting enough.

sh



--- Tomoko Schum <tomokoschum at knology_net> wrote:

> Hi y'all,
> 
> I am puzzled about NO3 levels that I am getting from my
> test kits lately.  I 
> tested my water a number of times with relatively new
> Aquarium 
> Pharmaceutical's test kit and a brand new Salfert's test
> kit, and the 
> results are consistently high around 30 to 40 ppm.  I
> have been sticking to 
> Tom Barr's recommendation on the tank maintenance and I
> never had a problem 
> until this year (this tank was set up in 2000.)  I
> stopped adding KNO3 for 
> two weeks or so and the NO3 level dropped to 10 to 15 ppm
> range, but some of 
> my plants look really nitrogen deficient now.  I think my
> fish load is 
> moderate (20 cardinal tetras, 5 harlequin rasboras, three
> or four coridoras, 
> two SEA and a few more small tetras) for a heavily
> planted 75 gallon tank 
> (equipped with four 55W PC's and a pressurized CO2
> system.)  I have not 
> changed fertilizing or fish feeding regimens over the 5
> years.  Is it time 
> to clean substrate (100% Fluorite) drastically or change
> out my 5 years old 
> media in my Eheim 2026?  I cannot really figure out where
> my extra nitrate 
> is coming from.  My tap water contains less than 5 ppm of
> nitrate (it 
> usually read 0.)
> 
> Tomoko 
> 
> 
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> 


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