fishless cycle - The Planted Tank Forum
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post #1 of 12 (permalink) Old 04-07-2018, 03:07 AM Thread Starter
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fishless cycle

My 15 gal tank was started on 3/3/18 . After 3 1/2 weeks it can convert 4-5 ppm of ammonia over nite but still no nirites . Is my cycle stalled ?
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post #2 of 12 (permalink) Old 04-07-2018, 03:13 AM
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My 15 gal tank was started on 3/3/18 . After 3 1/2 weeks it can convert 4-5 ppm of ammonia over nite but still no nirites . Is my cycle stalled ?
What are nitrates at? If you're getting nitrates, then your cycle is complete. If your tank can eat up 4 ppm ammonia in 24 hours and convert all the resulting nitrite into nitrate, then you're done.
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post #3 of 12 (permalink) Old 04-07-2018, 06:05 AM Thread Starter
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With the api test kit nitrates were over 40ppm . I did a 100% Water change and it got the nitrate down to 10 ppm . Thing is I never saw any nitrite spike
 
post #4 of 12 (permalink) Old 04-07-2018, 12:38 PM
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There are bacteria capable of a single conversion from NH3 to NO3.
Typically they are not the first bacteria to appear, only after a tank has aged.


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Growing is not that difficult.
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post #5 of 12 (permalink) Old 04-07-2018, 01:46 PM
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If you have 40ppm nitrates, then nitrites have been processing. Did you use bacteria in a bottle? Only way I can think that you never saw nitrite spike and have 40ppm nitrates.


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post #6 of 12 (permalink) Old 04-07-2018, 02:10 PM
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Here is a decent white paper on the matter if any are interested.

Temporal and Spatial Stability of Ammonia-Oxidizing Archaea and Bacteria in Aquarium Biofilters


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post #7 of 12 (permalink) Old 04-07-2018, 02:25 PM Thread Starter
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no bacteria added . just plants and dosing ammonia the tank is now 34 days old .
post #8 of 12 (permalink) Old 04-08-2018, 02:15 AM
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no bacteria added . just plants and dosing ammonia the tank is now 34 days old .
If there were enough plants that came from an established tank and weren't dipped in something that would've killed off all the bacteria, they will certainly contribute to speeding up your cycle. Sounds like you're good to go regardless.
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post #9 of 12 (permalink) Old 04-08-2018, 10:32 PM Thread Starter
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I jut did a 75 % water change ammonia 0 , nitrite 0 , nitrate is still 40ppm+ Is my test kit bad ? its dated 2021 ?
post #10 of 12 (permalink) Old 04-08-2018, 10:47 PM
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Assuming this is an API nitrate test kit were the instructions followed from the first test on.
Shake the crap out of bottle #2 before each use????


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post #11 of 12 (permalink) Old 04-08-2018, 11:11 PM Thread Starter
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yes 30 sec + on bottle #2 . add and shake like hell ,for 1 min wait 5 min for color to develop
post #12 of 12 (permalink) Old 04-08-2018, 11:33 PM
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Extra nitrates no Nitrites?

You have enough bacteria to convert nitrites to nitrates immediately, assuming you don't have something rotting in or on the substrate, try using the aquarium water to wash all the filter media, BB should be fine.
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