Fishless Cycle - High NO2 and NO3 low Ammonia - The Planted Tank Forum
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post #1 of 3 (permalink) Old 12-18-2017, 12:41 PM Thread Starter
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Fishless Cycle - High NO2 and NO3 low Ammonia

Hi folks:

It's been 3 weeks of a fishless cycle: it's a heavy planted tank - small 10gallon. I'm using pressurized CO2. I seem to be stuck at the following figures:

Ammonia 0.10ppm
Nitrites: 2ppm
Nitrates 70ppm

I was hoping that the Nitrites would drop to 0ppm, which then I'd add some liquid Ammonia to 2ppm, and monitor it's breakdown to 0ppm to ensure the cylce is done, but the Nitrites aren't moving. Should I do a 50% water change? Too much Nitrates bad for plants too no?

Thanks
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post #2 of 3 (permalink) Old 12-18-2017, 01:00 PM
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Quote:
Originally Posted by Aqua07 View Post
Hi folks:

It's been 3 weeks of a fishless cycle: it's a heavy planted tank - small 10gallon. I'm using pressurized CO2. I seem to be stuck at the following figures:

Ammonia 0.10ppm
Nitrites: 2ppm
Nitrates 70ppm

I was hoping that the Nitrites would drop to 0ppm, which then I'd add some liquid Ammonia to 2ppm, and monitor it's breakdown to 0ppm to ensure the cylce is done, but the Nitrites aren't moving. Should I do a 50% water change? Too much Nitrates bad for plants too no?

Thanks

I was neglecting one of my smaller tanks, nitrates at ~80-~120 before water changes, When I dropped them back to 5-20 I noticed my plants started doing better. I would do a water change and continue to monitor parameters.
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post #3 of 3 (permalink) Old 12-18-2017, 04:26 PM
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I would actually do a few water changes to get your nitrates down to 20-30 ppm. If you add 2 ppm ammonia you should get 2 ppm nitrates out once the cycle is complete so something in your water is leeching out ammonia like crazy.
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