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Fishyfishfish Fishyfishfish
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  • Posted on: 14/10 7:41
Re: Fishless cycle is just not working, guidance needed.... #1
A last update for this - I did a large water change to get rid of the ammonia, and used dechlorinator with the fresh water. I then redosed the ammonia to 2ppm; this morning the readings are 2ppm ammonia, 0 nitrite, 40 nitrate. I think it's pretty certain the cycle has stopped so I'm shutting it down because I need a break from it. I'll use the opportunity though to change the gravel to sand and completely change the decor.

Thanks for the help you gave with this Fishlady, appreciate it.


Fishyfishfish Fishyfishfish
  • Quite a regular
  • Quite a regular
  • Posted on: 13/10 10:02
Re: Fishless cycle is just not working, guidance needed.... #2
Yes I used dechlorinator, temp is 26 degrees and I’d say there is good oxygenation - I’m using a spray bar and it agitates the water surface well enough.


Fishyfishfish Fishyfishfish
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  • Quite a regular
  • Posted on: 13/10 7:23
Re: Fishless cycle is just not working, guidance needed.... #3
Quick update - I've just tested the tank and ammonia is the same as it was 24 hours ago, so I think the cycle has definitely failed. The question I have, and I think I know the answer, is has the beneficial bacteria that has built up now died off?

I think my main issue here is that nitrates were severely high (in part due to me only doing a 50% water change when I last retried to kickstart the cycling process), so that affected the cycle and the test results. I'm also not sure dumping the whole bottle of beneficial bacteria into the tank was a smart move either.

Unless the bacteria is somehow still alive I will be shutting the tank down completely and starting again.


Fishyfishfish Fishyfishfish
  • Quite a regular
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  • Posted on: 12/10 12:18
Re: Fishless cycle is just not working, guidance needed.... #4
I dosed it to roughly 2.5ppm so if it is being processed it’s incredibly slow.


Fishyfishfish Fishyfishfish
  • Quite a regular
  • Quite a regular
  • Posted on: 12/10 8:44
Re: Fishless cycle is just not working, guidance needed.... #5
Quick update - I tested ammonia and nitrite just and ammonia is still showing I’d say between 1&2ppm, whereas nitrite is showing at 0ppm. Nitrite cannot be getting processed because the ammonia would have been consumed by now so has the cycle stalled?


Fishyfishfish Fishyfishfish
  • Quite a regular
  • Quite a regular
  • Posted on: 11/10 15:41
Re: Fishless cycle is just not working, guidance needed.... #6
In the end I did a 40% water change, conditioned the water, then re dosed with ammonia. Today the ammonia levels don't seem to have dropped and nitrite still registers as 0ppm. I also did a nitrate test and that looks the same as it did before to be honest so I'm not sure what progress is being made, if any. It seems to be the slowest cycle in the history of tank cycling - a full 24 hours since I dosed the ammonia yet the bacteria don't seem to be consuming it for whatever reason.


Fishyfishfish Fishyfishfish
  • Quite a regular
  • Quite a regular
  • Posted on: 9/10 15:24
Re: Fishless cycle is just not working, guidance needed.... #7
What would I do without your advice lol.

I've retested nitrate and got someone else to look at the results and they reckon it's 80ppm, would you still recommend a water change or leave it alone for now?


Fishyfishfish Fishyfishfish
  • Quite a regular
  • Quite a regular
  • Posted on: 9/10 10:29
Re: Fishless cycle is just not working, guidance needed.... #8
Okay, nitrates straight from the tap is between 10-20ppm, nitrates in the tank looks more like 160ppm, the darkest red on the chart, but I always struggle to match the colours with nitrates.


Fishyfishfish Fishyfishfish
  • Quite a regular
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  • Posted on: 9/10 6:56
Re: Fishless cycle is just not working, guidance needed.... #9
I just wanted to give an update on this cycle but I think it has stalled.

I've just tested both ammonia and nitrite and nitrite is showing 0ppm and I tested it twice. There has been a constant source of ammonia, and I've been extra cautious about this, making sure it doesn't run out. Is it possible that nitrites are at a high level but the test kit doesn't recognise this, or has the cycle stopped? Surely I should be getting some kind of nitrite reading?


Fishyfishfish Fishyfishfish
  • Quite a regular
  • Quite a regular
  • Posted on: 2/10 14:05
Re: Fishless cycle is just not working, guidance needed.... #10
I started adding the Fluval Cycle as per the instructions, dosing 25ml per 40l, a day later there was still no Nitrites so I tipped the whole bottle in and now, finally, I have Nitrites at last! Current levels are 1ppm so hopefully this will now continue without issues.



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