Nitrate deficiency, high nitrates - The Planted Tank Forum
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post #1 of 34 (permalink) Old 07-03-2014, 03:17 AM Thread Starter
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Nitrate deficiency, high nitrates

I have several stems showing nitrate deficiencies,

Both tanks test at 40-60ppm, tap 15 ppm on the same api test solution. This makes no sense to me. Could something in my balance be stopping them for using it all?


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post #2 of 34 (permalink) Old 07-03-2014, 06:13 AM
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That's why I don't test and just add what the plants show they need. Tests are unreliable, especially nitrate tests.
But maybe if you post pictures someone can identify if you indeed are dealing with nitrate deficiency at least.
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post #3 of 34 (permalink) Old 07-03-2014, 07:07 AM
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why are you so sure its N deficiency?
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post #4 of 34 (permalink) Old 07-03-2014, 07:24 PM Thread Starter
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Older leaves are yellow and falling off, new growth is stunted, I added kn03 which I have not dosed sinc3 my nitrate test continually shows 40+ppm, and the plants came back. I dose Kh2po4 and K2s04, csm+b and fe. Currently


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post #5 of 34 (permalink) Old 07-04-2014, 03:40 AM
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Perhaps there is some imbalance in the ratios you are using.

Are you using a liquid test? Are you shaking the bottles and test tube REALLY WELL?

Have you calibrated the test?
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post #6 of 34 (permalink) Old 07-04-2014, 04:04 AM Thread Starter
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I'm using the api, i bought new a month ago. Tap shows 15ppm, my r/o 0, 10g 10ppm, 8.7g 20ppm, 55g and 29g 40+


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post #7 of 34 (permalink) Old 07-04-2014, 12:19 PM
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Excessive concentration of potassium in aquarium water can cause nitrate deficiency by reduced nitrate uptake even if concentration of nitrate in water is over optimal level.
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post #8 of 34 (permalink) Old 07-04-2014, 01:36 PM
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Try looking at co2. Without sufficient co2 all the nutrients in the world isn't going to help.


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post #9 of 34 (permalink) Old 07-04-2014, 02:08 PM
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Quote:
Originally Posted by Italionstallion888 View Post
I added kn03 which I have not dosed sinc3 my nitrate test continually shows 40+ppm, and the plants came back.
This alone tells me your plants are being limited despite the test results. The only thing you're adding with KNO3 is nitrogen and potassium. From the description of the plants nitrogen would be the culprit. Is there a toxic level of something preventing nitrogen fixation at such high levels? Who knows.

You could spend the next year trying to identify the problem. However, I would do 2-3 large water changes to reset the tank. Verify your dosing regime is appropriate for your parameters. This would logically eliminate nutrient deficiencies and/or toxicities. Then as Mistergreen suggested, look at CO2 or other possible causes.

List your tank parameters such as light level, CO2 or excel, planting density, water change amount and frequency. Then how much your dosing. It never hurts to double check things you think are correct. Assuming something is not a problem prevents you from ever seeing it.
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post #10 of 34 (permalink) Old 07-04-2014, 02:10 PM Thread Starter
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I will type out my schedule, liquid fertilizer mixtures and tank set up here in a few.


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post #11 of 34 (permalink) Old 07-04-2014, 03:13 PM Thread Starter
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I have 2 65w 600 cfl
3pm-9pm daily, minimal sunlight

Diy co2 using 4 2l pop bottles

Dosing


Plants







Fts


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post #12 of 34 (permalink) Old 07-04-2014, 03:24 PM
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This is a 29g tank? You might want to add another DIY co2 bottle or get pressurized.
Or another option is to reduce your light intensity.


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post #13 of 34 (permalink) Old 07-04-2014, 03:26 PM Thread Starter
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This is the 55g


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post #14 of 34 (permalink) Old 07-04-2014, 04:30 PM
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The nutrient levels are more than enough. In fact, you could reduce your dosing for a few of them. Based on your current nitrate levels, your tap water having 15ppm and your dosing, the uptake is around 25% according to this calculator. I totaled all the nutrients that you dose each day. Then I ran those levels through the calculator above assuming a 25% uptake. Below are the results.

This is a total of what you dose every day...
NO3 2.887
N 0.652
PO4 0.543
P 0.177
K 4.954
Fe 0.389
Mg 0.038
dGH 0.009
Cu 0.002
B 0.022
Mn 0.051
Mo 0.001
S 1.193
Zn 0.01

(x1) Plantex CSM+B 57 gm (approximately 13 1/4 teaspoons)
(x1) KH2PO4 16.2gm (approximately 3 teaspoons)
(x1) KNO3 98 gm (approximately 18 3/4 teaspoons)
(x1) DTPA Fe (11%) 39.747 gm (approximately 10 1/4 teaspoons)
(x1) K2SO4 45.005 gm (approximately 7 1/32 teaspoons)

These are the projected ranges you have. The lowest is right after a water change and the highest is just before.

NO3 32.3-45.3 Recommended range 5-30 ppm
PO4 3.3-5.7 ppm Recommended range 1-3 ppm
K 29.7-53 ppm Recommended range 10-30 ppm
Fe 2.3-4.4 ppm Recommended range 0.2-0.5 ppm

As you can see you could reduce PO4, K and especially iron. I've personally never seen issues with levels this high. However, they don't need to be so high.

What type of iron are you using? I don't have 12% listed so I estimated the levels. If it's Fe Gluconate this could be a problem. I have seen references to iron toxicity especially using gluconate.

Over all what you're dosing will NOT cause a deficiency. Toxicity? I suppose the possibility exists but I have personally never seen this. I think adjusting your dosing to target the recommended ranges and resetting the tank by several large water changes may help. If anything it won't hurt. I do think your CO2 delivery is insufficient for the lighting. The fluctuating CO2 levels is also most likely why you have BBA.

Just my two cents on the issue.
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post #15 of 34 (permalink) Old 07-04-2014, 04:38 PM Thread Starter
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Great information, pressurized co2 is in the works. I will back off a bit and do more water changes. I add about 3g of r/o water a week for top offs. Once I add co2, will I need to adjust my levels again, or will I see growth I should with my current Dosing schedule?


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