Re: Plants and CO2

> From: krandall at world_std.com (Karen A Randall)
> OK, when you wrote this in the last post, I thought you might have
> misspoken, but here you are repeating yourself.  While plants _do_
> respire, they do _not_ add to the CO2 levels in the tank (unless they
> are rotting) They use _much more CO2 than they give off.  Likewise,
> while they do use some O2, they give off _much_ greater amounts during
> photosynthesis.

Minor correction - plants use CO2 and give off O2 only during
photosynthesis.  When they are not photosynthesizing, either when the
lights are off or because conditions are not suitable, they produce
CO2 and use O2 just like everything else.