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C;N and elevated CO2

>Adding CO2 to a light-limited tank doesn't necessarily (even generally)
> indicate a _need_ for extra fertilization - light still acts as the
> "throttle" for metabolism. However, ensuring a sufficient amount of carbon
> definitely affects the _efficiency_ of nutrient utilization. This, in
> affects the growth _pattern_ of the plant itself.
> - -Y-
> David A. Youngker

In an interesting side note, one of the effects of elevated terrestrial CO2
that seems to be coming out now is a reduction in the efficiency of nitrate
uptake.  Of course, that's at concentrations of 700 ppm (i.e. end of century
levels) or more, I believe.