CO2, low PH and Ammonia - The Planted Tank Forum
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post #1 of 4 (permalink) Old 02-05-2013, 01:43 AM Thread Starter
Algae Grower
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CO2, low PH and Ammonia

I read in this forum that below PH 7, NH3(ammonia) becomes NH4 (ammonium) and NH4 is harmless to fish.

So if I add CO2 and that brings the PH down...does that still work to convert NH3 to NH4?
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post #2 of 4 (permalink) Old 02-05-2013, 02:12 AM
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I wouldn't say the pH is at 7, but at acidic pH, the equilibrium is favored towards ammonium, and at higher pH, ammonia is favored.

Injecting CO2 will lower the pH, and thus ammonium will be favored.

However, I would recommend that you strive to have 0 ammonia and ammonium in your aquarium.


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post #3 of 4 (permalink) Old 02-05-2013, 02:45 AM
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I think it is just the ratio of ammonium to ammonia that changes with pH, so even at low pH you still have some ammonia. Why do you have either one in your water? If it is from chloramine, just use Prime or equivalent to neutralize it.

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post #4 of 4 (permalink) Old 02-05-2013, 04:16 AM
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Ditto: Best ammonia reading is zero.

Do enough water changes to get over the emergency,
add fast growing plants,
add the right species of nitrifying bacteria to boost the population.
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