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Seeing as this entire thread is about the benefit of various options specifically for plants, I see no reason to do so.
As far as sand goes, a 30" x 12" bottom requires about 40 to 50 lbs of unrinsed playsand to reach a depth of between 2"-3"... so I would say about 18 lbs per square foot of bottom depending on how deep you want it.
I suit the plants to the environment just like we try to do with fish and water parameters... although I have done some experimenting with mixed results and am about to change my lighting, I don't anticipate ever using CO2 in my current tanks.
Jeff.
