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Old 07/29/2021, 08:11 AM   #2
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Join Date: Jul 2010
Location: Austin, TX
Posts: 1,973
Just as an experiment set an air pump outside and run an airline inside to bubble in your system. Monitor the pH for a hourly for a few hours to see what how it changes. An alternate experiment would be to take a bucket of aquarium water, set it outside with an air pump bubbling in it. If pH increases try just using the air pump from the room your tank sits in to bubble in your sump to see if that helps. You might also get the CO2 in your house tested to see if the problem is not enough air exchange with outside air.

"Our crystal clear aquaria come nowhere close to the nutrient loads that swirl around natural reefs" Charles Delbeek
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