What levels (ammonia and nitrate) can the bacteria (aerobic and anaerobic) withstand? - The Planted Tank Forum
 
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post #1 of 2 (permalink) Old 08-20-2014, 09:51 PM Thread Starter
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What levels (ammonia and nitrate) can the bacteria (aerobic and anaerobic) withstand?

Is there a certain threshold that's known to kill off bacterial colonies, both the aerobic and anaerobic, or is it that new types of bacteria start forming to process higher levels of certain parameters? I suspect that there are different bacteria at different pH levels, but what about ammonia? I've heard that one should be able to process 4ppm within 24 hours, but is there a threshold not to cross? I'm currently at 8ppm wondering if I've killed everything.

I'm also wondering about nitrate, and whether or not that could kill off bacterial colonies, aerobic and anaerobic, or is it that new types form to process the higher levels?
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post #2 of 2 (permalink) Old 08-20-2014, 10:20 PM
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Originally Posted by mef1975 View Post
Is there a certain threshold that's known to kill off bacterial colonies, both the aerobic and anaerobic, or is it that new types of bacteria start forming to process higher levels of certain parameters? I suspect that there are different bacteria at different pH levels, but what about ammonia? I've heard that one should be able to process 4ppm within 24 hours, but is there a threshold not to cross? I'm currently at 8ppm wondering if I've killed everything.

I'm also wondering about nitrate, and whether or not that could kill off bacterial colonies, aerobic and anaerobic, or is it that new types form to process the higher levels?

I don't have the answers to many of your questions, however, it is generally recommended not to exceed 5ppm of ammonia during a fishless cycle. Also, the relevant bacterial colonies perform less effectively/efficiently at pH, temp, etc outside of their range.

Not sure if you have "killed everything", but a 50% water change should bring you back down to ~4ppm and then you'll be back in the ball park to move forward... If you have ammonia building for some reason then you'll need to get that sorted out. If you are adding ammonia....then just keep it above 1ppm and below 5ppm.


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