CO2 and KH - The Planted Tank Forum
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post #1 of 2 (permalink) Old 03-28-2018, 12:47 PM Thread Starter
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CO2 and KH

Is there a minimum level of KH for the aquarium water recommended if using CO2? I remineralize to KH = 3 and was wondering is using CO2 in my tank would possibly cause a pH crash.
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post #2 of 2 (permalink) Old 03-28-2018, 12:55 PM
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pH crash from CO2 is nothing you should worry about. Problem with low KH is when you are using a pH controller to dose CO2, the measurements are getting a bit weird.
For a long time I had KH 1-2 with CO2 with no ill effects, now I'm trying to get it up to 3, so the pH controller will be able to do it's job, but if you are only depending on a drop checker KH is nothing to worry about.
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Last edited by nel; 03-28-2018 at 01:09 PM. Reason: typing error
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