Did a 70% odd water change yesterday as the tank has now finished cycling and I am planning on stocking today. Did some tests though to check no ammonia, nitrites and nitrates were low and all was fine. pH however was higher than I was expecting. Seems to be on the overlap between the API normaland high range tests. Tap is coming out as 7.0 but the tank is coming up as somewhere between 7.4 and 7.8 I have driftwood in the tank (which I thought was meant to lower pH if anything) a single small rock and plants. Substrate is sand. Anything to be concerned about?