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Re: carbonate rich gravel

There are two approaches to increasing CO2 in your aquarium. The first is 
the use of an acidic or neutral water with CO2 injection. A carbonate 
rich gravel will raise the pH and cause difficulties with this type of 
system. The second in the use of an alkaline water with a pH around 8 to 
8.5 in which the CO2 is delivered as bicarbonate. In this case a 
carbonate rich gravel is highly prized since it will buffer the water at 
the desired alkaline pH.