All tests were conducted with API master test kit and API GH/KH test kit. I tested my tap water earlier to find out the PH was about 7.5 (highest end of low PH test, lowest end of high PH test). I tested my 54 gallon tank to find the PH was 8.2. I know that the PH straight out of the tap isn’t the true PH because of the dissolved co2. And once the water outgasses, then the true PH is shown. I also tested my 20 gallon high. Also 8.2 ph. The 54 has been up and running aroun 6 months, the 20 high has been like 8 or 9 years. I tested one of my 20g long quarantine tanks which is just about finished cycling and has been up for a month. The PH is 7.5 like the tap. I haven’t added water to any of the tanks in weeks, so none of the gasses should be there causing the false ph. All 3 of the mentioned tanks have pretty good aeration and flow. Aeration releases co2 from the water, which would result in a higher ph as well right? But why is the newer 20 gallon long have the same ph as the tap if no tap water has been added in weeks? Wouldn’t the true ph be showing, especially with the addition of the surface agitation? I tested another one of my tanks which has been up for years and it also has an 8.2 ph, but has poor flow and aeration. Any ideas or explanations? Also, kinda unrelated to the PH confusion, but my water is pretty soft for having a high ph like 8.2. Out of the tap dGH is 5 and dKH is 4. Any particular reason for something like that? Thanks for any explanation!