KH 12, pH 7.6+, CO2 ~9- ok? - The Planted Tank Forum
 
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post #1 of 2 (permalink) Old 06-30-2008, 07:28 PM Thread Starter
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KH 12, pH 7.6+, CO2 ~9- ok?

How does that sound? My pH is really high- 7.6 or higher, and my KH is high too- 12 degrees. Using some online calculators and stuff I have found my water to have barely over 9ppm CO2. I am running *just* under one bubble per second. Should I up the bubble rate? I am using a HOB filter as well, so I am afraid of adding a lot of CO2 and just having it outgassed. Any suggestions?
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post #2 of 2 (permalink) Old 06-30-2008, 07:47 PM
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The CO2 chart is less than perfect. You're going to want to up your CO2 (you're target should be around 30-35 ppm, depending on what you're trying to do; some will run higher levels when trying to kill algae); my suggestion would be getting a drop checker to dial in your CO2 levels.

Let me ask you this: what's the KH of your tap water? If you're KH increases in the tank, something's adding carbonate (rocks or some part of your hardscape or filter media) - Co2 is added to the water lowering the pH and->making the water more acidic -> which means more minerals are dissolved into the water, which means-> the KH increases, which means -> the pH increases. Just a thought...
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