If your pH is at a constant 8.0 i would leave it pretty much. Opening the windows can help though as well as removing a lid if you have one.
It also matter what time of day you test the water, it will be higher at the end of your lighting schedule and lower when they first come on.
Chasing 8.3 is generally a bad idea if you do it with chemicals so I wouldnt go that route.
Hope that helps.