The reasons that I am asking this "silly question" are
1) I believe that brain is "well done" from posting time for invoices and
2) much more importantly
a) I have some wood in my tank which I had removed the tannins from before I induced fish some 8 months ago;
b) Chris put in two air bars and one air disk diffusers as she "likes watching the bubbles";
c) I had been "turning on the air" at night in order to compensate for the oxygen being comsumed by the plants;
d) she had placed one of the wood pieces on a portion of the disc diffuser;
e) three days ago I noticed that the water in the 2nd chamber of my sump (not in the tank) had a very, very slight yellow tint (it is normally crystal clear due to the quantity of biological and mechanical filtration media in my sump);
f) the air was apparently causing additional tannins in the wood to "dissolve in the water";
g) I ran the TetraTest kit tests and Ph was low;
h) I decided to not use Ph Up as I do not "like" instantaneous changes of water parameters in my tank;
h) I put a "holey rock" (just plain "ole Edwards Plateau Limestone") in my sump (ie. calcium carbonate).
Am I correct "here" in that CaCO3 will raise the Ph?