20ppm nitrate even after 4x WC... - The Planted Tank Forum
 
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post #1 of 15 (permalink) Old 03-11-2015, 08:25 PM Thread Starter
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20ppm nitrate even after 4x WC...

I had to change water too much so i gave all the fishes to someone.
1 week after, i changed around 30 to 60 % of all water (RODI + BeeShrimpGH+) 4 times in a row in 1 week, my RODI is 3 months old and makes crystal god pure water.

This is a ADA 60P with a eheim 2213, all tubings are cleaned, all substrate too, 4 new pads and ceramic and balls and cleaned this week.

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I dont overfeed at all, especially the last 2 weeks, the 7-8 shrimps didnt get any food at all, they just clean and wipe and dance and twist and shout.

Is it possible that even if i refill on a bag, the movement makes crap come off the bottom and generate more new nitrate ???

Picture test tubes : left is after 2 WC, right is 1hour ago...



I receive painted fire reds and ss+ cbs friday so i wish they enter a <5ppm nitrate soup.

Thanks a lot !

Mic.
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post #2 of 15 (permalink) Old 03-11-2015, 08:36 PM
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What substrate are you using?

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post #3 of 15 (permalink) Old 03-11-2015, 08:53 PM Thread Starter
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ada amazonia, setup is 9 months old
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post #4 of 15 (permalink) Old 03-11-2015, 08:54 PM
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Quote:
Originally Posted by shoyur View Post
ada amazonia, setup is 9 months old
I see, I was gonna say that the Amazonia maybe leaching some of that but if its that old I don't think that's the case.

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post #5 of 15 (permalink) Old 03-11-2015, 09:44 PM
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I suggest you calibrate your nitrate test. https://www.plantedtank.net/forums/sh...545#post800612 I've had an api nitrate test off my 20ppm before. You'd be surprised what the difference is. If you are keen on eliminating nitrates the addition of seachem purigen will finish the nitrates off.


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post #6 of 15 (permalink) Old 03-11-2015, 10:24 PM
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+1 on the calibration suggestion.

My API nitrate test consistently reads 6x actual.... Don't believe it unless you've checked it against a known reference.

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post #7 of 15 (permalink) Old 03-12-2015, 02:36 AM Thread Starter
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thx a lot, i will try the saltpetre solution trick tomorrow.

and yes i used purigen bag before, but its expensive, doesnt last long and leaches unknown stuff that makes shrimps stop making eggs, and smells weird, doesnt smell right heh.
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post #8 of 15 (permalink) Old 03-14-2015, 01:17 AM Thread Starter
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So i asked my ex wife (she's a chemist) to make me 5, 10, 20ppm
I used my old bottles (oct 2016 exp date)
and did another round of tests with brand new bottles (oct dec 2018 exp date)
And here are the results, gives something too red for 20ppm, so my aquarium isnt at like 30ppm, but more like 7-8 ppm.

Damn you, API tests !!!


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Thank you btw, i would have lost a lot more time thiking my water was the (only) problem.

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post #9 of 15 (permalink) Old 03-14-2015, 01:22 AM
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Quote:
Originally Posted by shoyur View Post
So i asked my ex wife (she's a chemist) to make me 5, 10, 20ppm
I used my old bottles (oct 2016 exp date)
and did another round of tests with brand new bottles (oct dec 2018 exp date)
And here are the results, gives something too red for 20ppm, so my aquarium isnt at like 30ppm, but more like 7-8 ppm.

Damn you, API tests !!!


Attachment 445818
Attachment 445826


Thank you btw, i would have lost a lot more time thiking my water was the (only) problem.

Glad you figured it out. All it takes is a little calibration sometimes.


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post #10 of 15 (permalink) Old 03-14-2015, 01:35 AM
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I think my test is borked too honestly. Sad part is its brand new. I have two anubias leaves that have yellowed and melted. My nitrates show as blood red so I stopped dosing KNO3. Weird thing is that no faster growing plants show any issues.
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post #11 of 15 (permalink) Old 03-14-2015, 01:54 AM
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Well, the good news is that the API nitrate tests are generally quite precise, event though they are notoriously inaccurate.

This means that they generally turn the same color for a given nitrate level on a consistent basis.. it's just that color and concentration don't always match the number on the chart.

If you do a calibration solution, you can observe what colors it really turns, and re-mark the chart with the correct numbers... Then you can keep using the test with your now corrected scale..

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post #12 of 15 (permalink) Old 03-14-2015, 02:44 AM
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I run calibration/standard vials with every test now.... and use smaller test volumes to save reagents.
1mL of test water, 2 drops of each reagent - you can do your tank and 3 standard samples in parallel with the 8 drops of each reagent, and get a result that means something.
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post #13 of 15 (permalink) Old 03-14-2015, 02:55 AM
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Quote:
Originally Posted by mattinmd View Post
Well, the good news is that the API nitrate tests are generally quite precise, event though they are notoriously inaccurate.

This means that they generally turn the same color for a given nitrate level on a consistent basis.. it's just that color and concentration don't always match the number on the chart.

If you do a calibration solution, you can observe what colors it really turns, and re-mark the chart with the correct numbers... Then you can keep using the test with your now corrected scale..
How do you calibrate a test ?


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post #14 of 15 (permalink) Old 03-14-2015, 02:59 AM
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You don't really calibrate the test, you really calibrate your eyes to what the tube colours really look like, as the supplied colour chart is off by miles....
What I have found:
a subtle orange colour, need to look hard to see it - around 5ppm or less
obvious pale orange - around 10ppm
dark orange - 20-30ppm
red-orange - 40ppm
once it is red, you are guessing without a known tube to compare to.....
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post #15 of 15 (permalink) Old 03-14-2015, 02:59 AM
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