Fishless cycle stalled?

Questions, tips and advice on how to mature an aquarium and biological filtration. Along with related questions about ammonia, nitrite and nitrate.
Tricksparrow
Posts: 2
Joined: Mon Oct 09, 2017 6:28 pm

Fishless cycle stalled?

Postby Tricksparrow » Mon Oct 09, 2017 7:01 pm

Hi all,

I'm currently cycling a 25g fluval accent and I can't tell whether my cycle is stalled, something weird is happening. Can anyone offer any advice? My cycle was started on 19.9.17 using pure 9.5% ammonia and dosed to 3ppm. I've put together a log of my water parameters since I've started:

21.9.17
Ammonia - between 1-2ppm
Nitrite - 0.5ppm
pH - 8.5

24.9.17
Ammonia - 1ppm
Nitrite - 0.5ppm
Nitrate - Between 10-20ppm
pH - 8.5-9

25.9.17
Ammonia - 5ppm
Nitrite - 0.5ppm
Nitrate - 20ppm

28.9.17
Ammonia - 4ppm
Nitrite - 2ppm
Nitrate - 50ppm

29.9.17
Ammonia - 3ppm
Nitrite - (for some reason I didn't record this)
Nitrate - 80ppm
pH - 7.6

30.9.17
Ammonia - 3ppm
Nitrite - 4ppm
Nitrate - 80ppm
pH - 7.6

1.10.17
Ammonia - 3ppm
Nitrite - 4ppm
Nitrate - 80ppm
pH - 7.6

4.10.17
Ammonia - 3ppm
Nitrite - 5ppm
Nitrate - 80ppm
pH - 7.6

6.10.17
Ammonia - 3ppm
Nitrite - 5ppm
Nitrate - 90ppm
pH - 7.6

9.10.17
Ammonia - 3ppm
Nitrite - 5ppm
Nitrate - 90ppm
pH - 7.6

daz4321
Posts: 4710
Joined: Mon Feb 18, 2008 9:35 pm

Re: Fishless cycle stalled?

Postby daz4321 » Mon Oct 09, 2017 8:07 pm

a cycle can take around 8 weeks to complete.

high nitrate can stall the cycle perform a large water change to reduce it and then redose ammonia to required level.

Tricksparrow
Posts: 2
Joined: Mon Oct 09, 2017 6:28 pm

Re: Fishless cycle stalled?

Postby Tricksparrow » Tue Oct 10, 2017 7:08 pm

Thanks, think a water change is on the cards. Roughly how much should I change? Or what level shall I reduce the nitrates to?

daz4321
Posts: 4710
Joined: Mon Feb 18, 2008 9:35 pm

Re: Fishless cycle stalled?

Postby daz4321 » Tue Oct 10, 2017 7:54 pm

water change, as much as you can and nitrates, as low as possible. (you will only lower nitrates to as low as your source water)

a 100% water change will not hurt as long as dechlorinated before entering the tank.

task list in order

large water change.
test ammonia.
top up ammonia level to desired reading.


Return to “Biological filtration and cycling”

Who is online

Users browsing this forum: No registered users and 1 guest