Here is the same response I wrote in your "High alk Low PH" thread:
Quote:
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Seriously, indoor elevated levels of co2 effect our tanks PH. You can aerate all day long but if the co2 is high in the surrounding air, the ph will not rise. Co2 lowers PH.
As a test, remove a glass of tank water, test the PH, take OUTSIDE and aerate for 1 hour, test the PH again. You can repeat this test INSIDE to get a comparison but you have already done that by testing your main display. I bet you'll see a dramatic PH rise in the 'outside' glass of water due to the fresh air (low co2)
Allowing fresh air (low in co2) to fill the room, the co2 in the tank's water will naturally lower. I have the same issue since we use natural gas for everything (fireplace, stove/oven, dryer, heat); our indoor co2 can climb quickly.
Unfortunately,keeping a window(s) open in the wintertime is not an option unless you're part polar bear so open one periodically if possible. Remember that high co2 levels are not good for you either.
Another option is to pipe in fresh air directly to your tank. One way is to extend the venturi tube so it draws from outside air. I am sure there are other ways too...
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