Chlorine and chloramine are much more toxic to fish than nitrifying bacteria so if there was a problem they would be affected first.
I don’t let my water sit for an hour, I fill a sink add prime clean filter media, and repeat.
does anyone know if zero carb can “go bad” does it need to be changed out ever?
the guppies are all new (I didn’t quarantine as I should have)
Chlorimines in the water
Also I was wondering what’s wrong with cleaning filter media in new water that’s been dechlorinated?
Nothing if you let the new water circulate in a bucket for 1 hour with water conditioner, prior to using it to rinse the media from your tank.
Do you have chloramine in your tap water? Check your water report. This could be water is registering as ammonia in your tank. Seachem ammonia alert is one of the best tests out there to detect harmful ammonia (the 0.25ppm ammonia may actually be bound harmless ammonium). See what it says.
And although I usually clean media in old tank water, there is a contingent of aquarist's that believe rinsing media in chloraminated tap water forces old weak biofilm off, but allows the more robust bacteria to live and repopulate the media.
When we did tests of the pipes in the distribution system in my locality, (I was the house microbiologist) we found ammonia consuming bacteria throughout the entire distribution system, unaffected by normal chloramine levels.
I would honestly love to do that, but the reality is for myself, I have no way in pulling that off, and IMO there's really no need. I am 100% certain as to what the end result would be, the only unknown would be how much bio-bacteria is killed. And that's where strength of the residual, the contact time, and the exact spp of bacteria would come into play. I can't imagine that anyone believes that oxidizing agents such as chlorine and/or chloramine are not harmful to the bacteria strains that keep our tanks balanced and safe for our fish. Obviously both kill fish, and the toxicity of both with a number of fish species has been well documented.
I think that perhaps there is another flaw in the no-harm theory, and that is assuming that all "nitrifying bacteria" are all one in the same, as in the ones found in a water distribution line, are exactly the same as the ones found in home aquaria. But are they? In some of the reports regarding water distribution, it has been suggested that some of these bacteria found within a water distribution line have over time built up a resistance to chloramine. Other bacteria being discussed in most of these peer reviewed papers are not even the same spp that I would consider the primary concern in an aquarium setting, which would be those closely related to Nitrospira moscoviensis and Nitrospira marina. Not once did I see either of those two strains being mentioned in any of these papers. In fact Nitrospira when mentioned is often added on at the end, almost like an afterthought to all of the other so called "nitrifying bacteria" found within the water distribution system.
I posted the following back in 2015, which received almost zero interest.
From the following paper .......
Nitrospira-Like Bacteria Associated with Nitrite Oxidation in Freshwater Aquaria - PMC
Oxidation of nitrite to nitrate in aquaria is typically attributed to bacteria belonging to the genus Nitrobacter which are members of the α subdivision of the class Proteobacteria. In order to identify bacteria responsible for nitrite oxidation in ...www.ncbi.nlm.nih.gov
"Traditionally, the bacteria responsible for the oxidation of ammonia and nitrite in aquaria were considered to be Nitrosomonas europaea and Nitrobacter winogradskyi or their close relatives, respectively (17, 18). However, there is some indication that both N. europaea and N. winogradskyi may not be predominant components of actively nitrifying freshwater aquaria (9). In seawater aquaria, however, N. europaea and close relatives do appear to comprise a significant proportion of the total eubacterial community, but N. winogradskyi was below detection limits (9)."
Today it seems that science is more focussed on Nitrospira-like bacteria. Thanks to Dr. Timothy Hovanec that years ago led a team of scientists that proved that Nitrosomonas and Nitrobacter were to be a mistaken assumption for many years. Ammonia is converted to nitrite by bacteria of the Nitrosonomas marina-like strain and nitrite is converted to nitrate by bacteria closely related to Nitrospira moscoviensis and Nitrospira marina. With several subsequent scientific studies by other scientists this data is now accepted and confirmed scientific fact. Nitrite oxidation in freshwater aquaria is believed to be mediated by bacteria closely related to Nitrospira moscoviensis and Nitrospira marina.
Paul C. Burrell, Carol M. Phalen, and Timothy A. Hovanec, “Identification of Bacteria Responsible for Ammonia Oxidation in Freshwater Aquaria,” Applied and Environmental Microbiology, December 2001, pp. 5791-5800.
Hovanec, T. A., L. T. Taylor, A. Blakis and E. F. DeLong, “Nitrospira- Like Bacteria Associated with Nitrite Oxidation in Freshwater Aquaria,” Applied and Environmental Microbiology, Vol. 64, No. 1, pp. 258-264.
IMHO we need to be careful when generalizing on forums such as these. I'm all for learning new things, including new science when it becomes available, but I think that it is foolish to think that one can simply extrapolate the findings in a paper that is viewing what takes place in a water distribution system, and the various "nitrifying bacteria" typically found in a water distribution system, where among other things tolerance levels and/or resistance can come into play, to what takes place in an established aquarium. I'm certainly not an expert on any of this, nor do I hold a qualifying PhD in this area. What I do have is a lot of common sense, and a lot of years of experience in this hobby. Chlorine & chloramine are toxins, and at elevated levels will kill fish, and the bacteria that support the lives of those fish. What the exact breaking point is in an established (or worse, unestablished) home aquaria I do not know, nor do I wish to experiment to find out. Well, at least not with my fish. I've already seen the first hand results in other folks tanks.


This was quite eye opening, and something I will def be changing.My filtration system is big enough that I have large areas for mechanical and bio. My bio is the engine of my tank and I very rarely touch it, maybe a quick rinse once per year in tank water.
My mechanical side, however, is sponges and what not, stuff that gets clogged if not cleaned properly. So ALL my mechanical gets a thorough wash under the tap in warm water, every water change. It gets a proper blitz. It's squeezed and squeezed until the water runs clear.
Some may gasp in horror at this practice but I don't care about losing the minimal weekly build up of good BB in my mechanical side, because my bio side is what matters to run my tank. And this practice has served me well for years.
It could be that the tiny bio side in that small aquaclear 70 isn't that efficient (and what's this "zoe carb" you mention?). And then by washing your mechanical media, which will contain some BB, in treated tap water, which I agree is very very risky if one week you get a poor mix or whatever, then you've killed some bacteria that your system very much relies on due to your inefficient bio side.
If this is indeed happening then you will get a mini cycle which can cause issues. You may say, "but i've always done it this way and been fine up to now". That may be so but as I said, it just takes one bad mix in your sink and you'll be in trouble.
I can understand that you can't really give it a thorough rinse in tank water because it'd probably take half your tank to rinse it really good. But I believe what i've said above could be the crux of your problem.
This was quite eye opening, and something I will def be changing.
Wouldn’t have seen the error of my ways if it was not literally spelled out for me haha
thank you, I will not continue to do it this way.
I will have to clean my filter more regularly so it can be cleaned enough with the water drained from the tank itself.