Nitrites Stuck in fishless cycle - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 09-08-2015, 07:33 PM Thread Starter
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Nitrites Stuck in fishless cycle

I have been able to get 5ppm of ammonia down to 0ppm in 12 hours. However my Nitrites will not go down. It has been two weeks and it has not gone down. I have a heavily planted tank and Eheim 2213 filter on my 29 gallon.

Thanks
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post #2 of 5 (permalink) Old 09-08-2015, 07:43 PM
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Quote:
Originally Posted by Docock View Post
I have been able to get 5ppm of ammonia down to 0ppm in 12 hours. However my Nitrites will not go down. It has been two weeks and it has not gone down. I have a heavily planted tank and Eheim 2213 filter on my 29 gallon.

Thanks
The fishless cycling guide stickied in this forum says the nitrite phase can take 3 weeks or more.
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post #3 of 5 (permalink) Old 09-08-2015, 07:48 PM
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How long has it been since you started the cycle?
The bacteria that deal with nitrites take quite a bit longer to develop to a sufficient level to neutralize the peaking nitrite, than the bacteria which deal with ammonia.
Be patient, give it another week or so.
In the meantime, don't add any more ammonia daily or every 2nd day than it takes to increase the ammonia level to 3 ppm, rather than 5 ppm.
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post #4 of 5 (permalink) Old 09-08-2015, 09:23 PM
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Also the nitrite scale tops out pretty early on most test kits... if yoire getting nktrates, do a very large 80%+ water change to bring them down to a readable level, redose ammonia and be patient, youre getting close


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post #5 of 5 (permalink) Old 09-09-2015, 12:57 AM
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The bacteria do not handle high nitrites well. As suggested above: Big water change to get the NO2 well under 5ppm, and as low as 1-2ppm is just fine.
Then just dose the ammonia to 3ppm. If the NO2 hits 5ppm again, then repeat the water change and dose even less ammonia. Maybe just keep it at 1 ppm once a day.
Once the bacteria catches up, dose a little more ammonia to encourage the bacteria population to increase.
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