He better be there, I paid for his ticket/reservation! I am talking about Dr. Shawn Prescott!
I will tell you something else Sean, something I bet you didn't know! You wouldn't remember this, but you were actually one of the people who first inspired me to get into the hobby! In 1997 and 98, you answered many questions from me on the newsgroup rec.aquaria.
Here is one of your quotes that I stil have in my library: Sound familiar?
Light intensity in relation to CO2 (quote by Sean Murphy, Fisheries / Wetlands Biologist)
"Intensive light creates a higher photosynthesis rate in plants then does moderate or low levels of light. Ok, basic botany, Plants use light and CO2 to create sugars via photosynthesis, they use the sugars and O2 for respiration, synthesis, and growth. For some reason higher plants retard respiration and growth in tissues that are actively photosynthesizing, (ever wonder why a plant bends towards a light?). Active photosynthesis also assists the plant in the uptake of nutrients. The easy pathway for aquatic plants to obtain CO2 is when it is dissolved in water. The hard way is from the stripping of CO2 from bicarbonate dissolved in the water.
High levels of photosynthesis require an adequate level of CO2 to maintain the process. If no CO2 is added to an intense light situation, the bicarbonates will be stripped leaving a free -OH molecule to combine with free +H (making H2O) that was set free when carbonic acid (dissolved CO2) dissociated. If there is another source of bicarbonate other then carbonic acid then +H made available from other acid's will be removed from solution to compensate for the increase in -OH. When the +H is taken up like this the pH rises. By not adding CO2 the pH swings in a limited body of water (aquarium) become quite large.
Algae does not have a restriction on respiration during photosynthesis, when the plants start to slow down the photosynthetic pathways due to the lack of CO2, the uptake of nutrients also slows down. Algae take advantage of this situation taking up valuable nutrients while the higher plants are struggling for CO2. Algae bloom.
Aquariums are a balancing act, if you can find the right balance of light and CO2 addition then you should have an easier time maintaining a beautiful tank. If optimum growth is a goal you really need to cover the bases. If only good growth is a goal then you can do less intensive gardening, i.e. no CO2 additions, under a moderate light source."
Robert Paul Hudson
RAOK Club #1
Kindness like love is unconditional