You really do not need to do anything in regards to pH. pH can be a sign that something else is off but it rarely needs adjusting. pH varies throughout the day (high during the photoperiod, aka day, and low at night) and it also has a relationship with the amount of carbon dioxide within a home. The more insulated/closed off the house with more inhabitants, the lower the pH. As a result, you can have "low" pH at night party during a cold/hot spell of 7.7 and then when the next day comes around and you can open the windows, it could increase to 8.3 with no additions to the tank. Trying to raise/lower pH at the "wrong times" can be dangerous as the tank will react over time. Bumping the pH just before the lights come on can cause pH to increase a lot. It is best just to leave pH alone. It is something we can easily test for but there really is nothing to "correct" about it.