E.I. Dosing and a loss of N03 - The Planted Tank Forum
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post #1 of 5 (permalink) Old 10-23-2014, 11:04 PM Thread Starter
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E.I. Dosing and a loss of N03

I have a 40b, ADA AS, 2 e-90 LED lights, press. c02, sump, and a 150 sqft cart filter. I have made a few changes recently regarding ferts and lights. i have never had an issue before with algae until now. I can't seem to get my n03 level up. i am already adding about double the n03 suggested and still it will not test in water after 24hrs, is this normal.
Like i said i am new to dry ferts and used liquid previously following the one pump per 10 gal directions

the ferts are from GLA
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post #2 of 5 (permalink) Old 10-24-2014, 02:04 AM
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Check the test kit.
If you are using liquid reagents shake them a LOT.

Calibrate the tests. Instructions are here (PT) somewhere.

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post #3 of 5 (permalink) Old 10-24-2014, 03:18 AM Thread Starter
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yep i had a bad test kit, used it 3 weeks ago and seemed to be accurate
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post #4 of 5 (permalink) Old 10-24-2014, 04:12 AM
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EI will give you a dose recommendation to maintain a target level in terms of PPM. If you have a lower amount to start with then what is happening is your dose is being consumed by the plants or something is removing it from the water column.

Go use the nutrient calculator to determine how much to dose a target of let us say 20 ppm and you should get a bigger amount to dose. You can then dose than then check 24 hours and see if the nitrates are still there.

Also check your test kit. It could be expired too.

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post #5 of 5 (permalink) Old 10-24-2014, 02:52 PM
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Check your test kit even if it isn't expired. NO3 tests are notorious for being mis-matched to the chart.

My API nitrate test, which is well before its expiration date, consistently reads 3ppm tap water as 20ppm, no matter how much I shake those bottles. I made a 20ppm test solution from distilled water and KNO3 and it read that as something over 80ppm but less than 160ppm.

You can just re-mark the chart for the colors your test is giving. Mine seems to be wildly off calibration, but it also seems to be reasonably consistent in what color it gives.
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