What about biogenic decalcification? See P78 of "The Optimim Aquarium".

In article 9,
Moose wrote:
That's rather odd. I know a Dr. of paleobiology who also teaches honours
chemistry who said that it would work.

Chuck Gadd wrote in
:

On Fri, 27 Dec 2002 02:53:10 GMT, Moose
wrote:

why not just use baking soda?

Adding baking soda only increases the KH (and so increases the pH).
It does not in any way add CO2.

See the second "Myth" section on this webpage for an explaination:
http://www.csd.net/~cgadd/aqua/art_plant_co2chart.htm


Chuck Gadd
http://www.csd.net/~cgadd/aqua




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