Nitrite(NO2) spike, Unexplained??? - The Planted Tank Forum
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post #1 of 7 (permalink) Old 04-04-2017, 02:12 AM Thread Starter
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Nitrite(NO2) spike, Unexplained???

Established tank of 3 years.
Med-Hi light, 1/2 EI dosing, CO2(30ppm) etc...

Walked in the door this evening and noticed a surface scum.
Grabbed some water for a testing.
GH = 7
KH = 3
Ca = 30ppm
NH3 = 0
NO2 = 2+
NO3 = 20ppm(relative to EI dosing)
PO4 = 1.5ppm (ish)

Used a small container to start the water change by skimming off the scum.
Seemed yellow and clumped when in the cup, very slimy too.
Then began cleaning and found all 5 Amano shrimp dead(recent death).
I am sure the NO2 did them in, they have been kicking for over a year and some at the two year+ mark.
Shame it didn't kill the pond snails. Fish are okay, changing water now.

So the puzzle is how does one just accumulate NO2?
Ammonia @ zero and nitrates right @ about dosing levels?
Tested NH3 on Friday for this tank and reading of zero.

Typically an established tank will show ammonia or nitrate elevations.
May not ever see the NO2 levels increase during this process.

Nothing has changed in this tank for 6 months.
Weekly 20% WC's are all that's going on.
Other than way too many plants.


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post #2 of 7 (permalink) Old 04-05-2017, 02:41 AM Thread Starter
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Better this evening.

Ammonia = 0
Nitrate = Dosing equivalent
NO2 = a bit less than yesterday, still a form of purple.

Fish all good, found no dead shrimp.
No surface scum today either.

Prime and another 20% WC completed.

No One???


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post #3 of 7 (permalink) Old 04-05-2017, 02:46 AM
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Dosing CSM +B with EI? Idk if that or something else would have killed the shrimp but is it possible the nitrite spike was the result of the dead shrimp and not the cause?

Dan
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post #4 of 7 (permalink) Old 04-06-2017, 12:57 AM Thread Starter
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Update:

NO2 is almost that light blue color = 0 or close right now.

Still no ammonia, NO3 is less than dosing(being consumed by plants).
Fish are fine, still a few Amano shrimp moving around(lost count).

Last time this happened it was a stinkbug invasion.
Found several in the tank, that is I suppose what started the surface scum.
Found no insects etc. and have been checking everyday.

Will right this up as another aquatic mystery?
Don't think the shrimp died first, not with all the surface scum.
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post #5 of 7 (permalink) Old 04-06-2017, 01:05 AM
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Glad things took a turn for the better and hope it all works out.

Dan
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post #6 of 7 (permalink) Old 04-06-2017, 02:09 AM Thread Starter
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@Dman911 thanks for your comments!

Water parameters that we can measure can easily be fixed.
If not almost over-with this evening, fish & shrimp would have went to a quarantine tank.

Plants have seemed to like this little event(new growth spurt).
May have been NH3 they consumed? Like dosing urea? Who knows.
Water clarity has been pristine except for the surface scum.
Once removed the scum has not thought of returning.

Isn't this all an experiment anyway?

If the plants were dying this would be a major malfunction.
It would then involve at least 1 vacation day from work.


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post #7 of 7 (permalink) Old 04-06-2017, 02:25 AM
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Originally Posted by Maryland Guppy View Post
@Dman911 thanks for your comments!

Water parameters that we can measure can easily be fixed.
If not almost over-with this evening, fish & shrimp would have went to a quarantine tank.

Plants have seemed to like this little event(new growth spurt).
May have been NH3 they consumed? Like dosing urea? Who knows.
Water clarity has been pristine except for the surface scum.
Once removed the scum has not thought of returning.

Isn't this all an experiment anyway?

If the plants were dying this would be a major malfunction.
It would then involve at least 1 vacation day from work.
I think you managed to sum up the hobby in one sentence. "Isn't this all an experiment anyway" One long never ending experiment lol, I think all the advances in the hobby are made this way. Couldn't have said it better.

Dan
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