Tank cycle High Nitrites - The Planted Tank Forum
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post #1 of 7 (permalink) Old 03-07-2018, 03:58 PM Thread Starter
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Tank cycle High Nitrites

I used pure ammonia to cycle tank no plants,

Iíve added ammonia everytime ammonia dropped to 0-0.25 from 1ppm now nitrites is over 2ppm but ammonia keeps dropping to 0-0.25 every 24 hours , do I keep dosing ammonia?
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post #2 of 7 (permalink) Old 03-07-2018, 04:33 PM
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Yes otherwise youíll starve the ammonia feeding bacteria and stall the cycle.

Once youíre cycled you need to make sure there isnít a gap in the nutrient cycle so you need to add fish or keep feeding the tank.
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post #3 of 7 (permalink) Old 03-07-2018, 04:38 PM
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You keep starting new threads and asking the exact same question that has been answered already.
As explained before, a few times now, your cycle is not complete until ammonia and nitrites zero out within 24 hours. You need to keep dosing ammonia daily to reach 2-3ppm until the cycle is complete. Do water changes once NITRATES reach 20ppm and then dose ammonia again to get it up to 2-3ppm.
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post #4 of 7 (permalink) Old 03-07-2018, 04:47 PM Thread Starter
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Ok thanks and it doesnít matter how high nitrites get?
post #5 of 7 (permalink) Old 03-07-2018, 05:22 PM
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Correct. Here's your conversion numbers: 1 ppm ammonia --> 2.7 ppm nitrite --> 3.6 ppm nitrate. So if you dose 2 ppm ammonia, you'll yield 5.4 ppm nitrites. If you're below that within 24 hours, it means your bacteria is starting to convert that to nitrates. You just need to keep feeding ALL the bacteria until you have 0 ppm ammonia and 0 ppm nitrite within 24 hours. So keep dosing 2 ppm ammonia daily, checking both nitrites and ammonia daily and on, lets say day 6, check to make sure nitrates are at or below 20 ppm. If they're close, do a water change and keep going with the ammonia dosing.
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post #6 of 7 (permalink) Old 03-07-2018, 05:43 PM Thread Starter
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Thanks!! My nitrates are at 20-40ppm but why water change? Thereís no fish
post #7 of 7 (permalink) Old 03-07-2018, 06:22 PM
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Because high nitrates are believed to slow down the cycle. It was the advice I was given and it worked, so I pass it along.
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