Dosing Nitrogen when Nitrates are present - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 05-17-2011, 05:39 AM Thread Starter
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Dosing Nitrogen when Nitrates are present

Hey all-

Quick question:

I have a tank that consistently stays at 12.5 to 25 ppm of nitrates...do I need to dose nitrogen?

Tank parameters:

29g - fully cycled, established
76 degrees
4 kH
5 gH
0 ppm ammonia
0 ppm nitrite
12.5 to 25 ppm nitrates
co2 pressurized 2 -3 bps (in the green)
48W T5HO
pH 7 (evening after co2)
pH 7.6 (morning before co2)
weekly 50% water changes (r/o - tap mix 2 to 1 ratio respectively)

I dose phosphorous and trace elements. Stopped dosing nitrogen because of consistent 30 ppm nitrate level and fuzz algae, then algae went away when I stopped the dosing.

So, do I need to dose the nitrogen when my nitrates remain a stable level?
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post #2 of 6 (permalink) Old 05-17-2011, 01:59 PM
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If you do weekly water changes where is the nitrate coming from? I guessing your test is off. I'd does N anyway. You might want to dose potassium too.


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post #3 of 6 (permalink) Old 05-17-2011, 02:05 PM
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Quote:
Originally Posted by mistergreen View Post
If you do weekly water changes where is the nitrate coming from?
Overfeeding, overstocking.... Not enough plants to uptake it.

I can pretty easily hit 15 ppm of nitrate in my tanks without dosing much at all.
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post #4 of 6 (permalink) Old 05-17-2011, 05:03 PM
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Assuming the the test are calibrated and correct to begin with is the 1 st question.........

Only then, do you move on to management changes etc.

FYI........




Regards,
Tom Barr
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post #5 of 6 (permalink) Old 05-17-2011, 05:05 PM
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Quote:
Originally Posted by Gotara View Post
H Stopped dosing nitrogen because of consistent 30 ppm nitrate level and fuzz algae, then algae went away when I stopped the dosing.

So, do I need to dose the nitrogen when my nitrates remain a stable level?
I dose 45ppm of NO3 every week and I have a packed tank full of well fed fish:



See any algae?

Nope.....cannot be due to excess NO3, it could be to 101 different things, but not NO3.

You need to calibrate the test kit 1st.




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Tom Barr
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post #6 of 6 (permalink) Old 05-17-2011, 06:54 PM Thread Starter
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Thanks for the replies.

I "inherited" this tank from an old roommate and I am trying to keep it healthy...it is overstocked, so nitrates are going to be high.

Is dosing nitrogen basically adding nitrate? That was basically the question. And if a consistent level of nitrates provide enough nitrogen to the plants or should I still supplement?

From what I've seen from the replies is that I should still dose the nitrogen.

Thanks for the help and wisdom.
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