Hi all, first post here. I'm a returning hobbyist after being away for 10 years and I've run into a problem with my cycle. I have a Waterbox 20 AIO that was started at the end of March 2021. Approximately 15 lbs of CaribSea Life Rock, 15 lbs of Caribsea Arag Alive Special Grade sand, and a dozen or so ceramic bio balls in the center chamber. Fishless cycle; seeded day 1 with 4oz Dr Tim's one and only and I've spiked with Dr Tim's ammonia chloride per the Dr Tim's schedule. I'm at about 50 days into the cycle give or take and the cycle still has not fully completed. I have high nitrites that will not drop, like max on my API test kit (5.0 ppm+). I've also had my lfs test the sample with similar results. Late April 2021I reseeded 4oz of Dr Tims. I also respiked with ammonia chloride (to 2 ppm) to test if 2 ppm ammonia would be converted within 24 hours, it was not, more like 1 ppm was converted. I do have nitrates, around 60 ppm. So the tank has technically cycled but the conversion of ammonia is extremely slow and high nitrites are present. Not sure how to proceed here or what to do. I'm old school and would like to see my ammonia and nitrite at zero and able to convert quickly before adding any livestock. Thanks!
Heyo!
So nitrite is non-toxic to marine fish, at least short term, even at concentrations we figured was high:
http://reefkeeping.com/issues/2005-06/rhf/index.php
However, I am also someone who'd want nitrite to read 0 24 hours after dosing ammonia too. Not because I don't believe in the article. I fully do. I had nitrite reach 5ppm or so and did not dose Prime or anything to detoxify it. Fish could not care less.
However, I think it is entirely possible for nitrite to reach high enough levels to start to harm fish. One study suggested 25ppm nitrite max for ocellaris clownfish, any higher and lesions and stuff could form. And 25ppm can absolutely be generated during the cycling process. That's around 9.25ppm ammonia, which if one say doses 2ppm ammonia five times and there was no nitrite oxidation, then yeah boom 25+ ppm nitrite.
So yeah, I totes want to see 0 nitrite as well.
With that said, I am starting to not believe in the necessity of 2ppm ammonia/day consumption to be 100% safe. May even be closer to 1ppm/day, which is where you are at.
Honestly, what I would do is do a 100% water change, just to reset all the numbers to 0. Then dose 2ppm ammonia and see how your tank processes it.
You can of course do serial dilutions to see where your nitrite is at now, but it is a pain to get a close estimation. Might as well make it easier on yourself to see how everything is going.
Good luck!