hello all as the title says I have another PH question. butt you can see by my picture my ph runs between 7.5 and 7.7 it goes up as high as 7.9 after water changes( indicated by red circles) . I live in a condo with myself and my wife. On a regular basis my ph will drop to around 7.4 at night. I use to top off with kalk but I was elevating my kh way to high. I’m not sure what other options I have. Running a outside line from my skimmer to outdoors is not a option either. I need some professional input