I have a somewhat planned 55g with about 2W/g and I also have well water which comes out of the ground at about a ph of 5.9. I use a calcium carbonate injection pump system to being that up to about 7.0. I do a 25% water change every two weeks, even before the change all my params are 0 nitrate, nitrite, ammonia, KH is about 60 ph is 7.4. After the water change ph is 7.4. So the question is why is the ph high? are the plans using all of the CO2 making the PH go up? Should I use the water before its buffered? Is the acid water do to dissolved CO2, could I be that lucky? I use flouris excel.