Can CO2 injection kill nitrifying bacteria? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 11-14-2011, 07:37 PM Thread Starter
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Can CO2 injection kill nitrifying bacteria?

Before I changed to my fluval edge, I had a couple fish in a 5.5g tank and I was trying to cycle while growing plants at the same time. I went to the pet store for a water test after quite a while and the test showed pretty much no real progress with the cycle. It also showed a very low ph. The woman working there seemed to think that my DIY co2 system caused the water to become to acidic and it killed off the bacteria I needed.

I have another tank now, and it's about 4 weeks into its cycle and it actually is making progress. However I want to set up co2 again for my plants. Is there any truth in what she said about it killing bacteria?

I also had a piece of driftwood in the tank, which I know can lower ph, but its in the new tank too, which has normal levels.
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post #2 of 4 (permalink) Old 11-14-2011, 07:43 PM
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not really...

nitrifying bacteria are O2 dependent.

Id think you'd kill your fish b4 you killed the bacteria.


And define no progress... do you mean your A/N/N level's are still high? or they like in the middle not moving?

If its in the middle not moving, it means your system is trying to get equilibrium while growing at the same time.
As more and more gets produced, and converted, the plants are quickly using what they can get forcing the middle values constant, until everything drops later on (ie growth cap).

Are your plants growing?
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post #3 of 4 (permalink) Old 11-14-2011, 08:37 PM
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what he/she said...in our tanks, we would rarely get the CO2 levels high enough to kill them...also, even in grow out tanks high light/ferts/co2...you can still successfully grow a denitrifying colony


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post #4 of 4 (permalink) Old 11-14-2011, 10:56 PM
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At a low pH (less than 6 or so) the bacteria do not do well, they do not propagate nearly as much, nor do the function as well, though at that pH, ammonia is typically a less harmful form called ammonium.


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