On Wed, 09 Jul 2003 23:47:22 GMT, "Robert Flory"
wrote:

Actually yes they do, but no you don't have to ADD CO2 which is what Victor
meant.. Normal CO2 level in a tank is around 3 - 4 %. Lots of plants will
grow well at that level with low light levels.

3-4% would be 3-4 parts per hundred. The actual level of CO2 in a
tank is 3-4 parts per million, ten thousand times less.



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