Randy Holmes-Farley
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My Tank Thread
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Which as I understand it the PH will rise not fall due to photosynthesizers consuming the CO2 not lowering it or am I missing something here?
The pH rises in the tank due to CO2 consumption, making it deficient in CO2 relative to the home air (most often, anyway), and in that situation, a skimmer aerating the water will tend to lower the pH back toward equilibrium with the home air by driving in more CO2. In other words, the pH would rise higher in the absence of a skimmer in that scenario.