Thanks guys, I found what I needed. It is the KH
I need to monitor to make sure my pH will remain steady. Those articles were great!
"One caution: keep track of your KH
(Carbonate Hardness) readings of your water, since CO2
forms a weak acid (Carbonic Acid) that can slowly reduce your KH
levels in your water. If KH
is allowed to reach zero, pH can drop precipitously. If your KH
reads less than 4, try adding a little Sodium Bicarbonate (Baking Soda) to increase KH
. Regular water changes become vitally important in tanks with supplemental CO2
, since water changes will constantly replenish the water's natural buffers, helping to maintain a more steady pH."