Re: [APD] NO3

[Chris Hotte <ecwh at cogeco_ca>]

S. Hieber wrote:

> You can be concerned with either, just keep the 4.4
> relationship in mind. Nitrate-nitrogen is the N in NO3, so
> it's a smaller value than the NO3. Oft quoted target values
> are *around* 10 ppm for NO3 (which equates to about 2 ppm
> nitrate-nitrogen). I've heard some report good results with
> 10 ppm nitrate-nitrogen but I  don't know if that was
> temporary or involved a lot of extra maintenance.
>  
What I have done however is remove the KN03 from my PMDD mix. I was due 
for a new batch anyhow. I plan on keeping an eye on it for a while until 
I get a baseline for it's natural rate of appearance in my tank. I had 
done a major plant re-arrangement and with the previous water change I 
couldn't vacuum because the roots hadn't yet taken. Consequently 
vacuuming today resulted in allot of detritus being picked up along with 
my 50% water change.

> What brand/model of test kit was it? Sounds like a lot of
>  
Aquarium Pharmaceuticals.

> margin in the measurement. Which isn't uncommon with many
> of hte test kits we us. I have a devil of a time with some
>  
Starts with a bright yellow for 0ppm, then a hint of orange for 5ppm, 
then 20 and 40 are orange moving into red. Then 80 and 160 both the 
colour of blood.

> of those color comparator tests too. It's why I swore off
> pH color tests and got an electronic monitor. When I used
> the color comparator pH tests, I used to gather the family
> around and we vote on what standard color was closest to
> the sample. 
I usually just ask my wife or the cat or both. Between the three of us 
we can usually come to some conclusion.

- Chris.
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