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I have high co2 levels in my home due to being sealed up. The ph went higher when I opened the windows to let fresh air in,reducing my co2 levels. Through gas exchange in my tank it also raised my tank ph beyond what it normally runs. Adding a co2 scrubber, a line from your skimmer to fresh air or opening my windows allows gas exchange with less co2 saturated air, raising ph.
I understand a ph of 8.2 is still not high enough to cause issues. I believe my issue is my tank always hits a max of 8 during peak light hours. The few times a year I open the windows in my house my tanks ph will go up to 8.2 that day. With the ph going to 8.2, which is not normal for my tank, causing issues because it is out side of my tanks norm.
I don't think it has anything to do with lights. Especially since opening a window doesn't allow more light in, just air.
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