I really need to get a digital pH tester. The API high range ph test is incredibly difficult to read for me. So, that being said, I don't really know the swing.
Our house is incredibly not ventilated though, so I think a high level of carbon dioxide in our house could be contributing.
So I think I might need to aerate the water better, but I don't know how. I have the 300gph return pump from the sump split up into two return lines and they are both pointed at the surface of the water, rippling it. Also I have the overflow box which aerates the water when the water is skimmed through it. Then I have massive aeration in my sump where the water flows through 3 pvc
pipes separating 3 containers. I also have macro algae in my refugium on a reverse light cycle from the display tank. Then I have 1290gph water flow inside the tank. So it doesn't seem like aeration would be the issue!
I guess at this point all I can say is that I *think* I have a pH problem, but I won't know for sure until I get a digital pH tester. Though I do know this morning, using the API high range pH test, it was a brownish color closest match to 7.8 on the color chart.
So many unanswered questions that I don't even begin to understand. Kind of makes me feel like a failure.