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Re: Green light

I enjoyed your post George... if anyone is confused please look on page 
21 of Aquarium Plants by Barry James (or any Plant Physiology textbook). 
Photosynthetic plants clearly absorb light in the green part of the 
spectrum... just less efficiently than in the red or blue region. This is 
why plants appear green. It was always explained to me that red pigment 
in a plants photosynthetic organs is a protective measure in response to 
strong light.
On another note, many aquatic plants have the ability to double in 
size every 2 to 4 days under optimal conditions... to see an ad boasting 
of 6" growth after several weeks is truly hilarious... what is amazing to 
me is that the plant actually survived that long under such obviously 
inadequate conditions!