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You don't need more oxygen than produced from the plants.

Surface agitation reduces CO2 in the water. This films shows you two surface agitation-levels:
http://hem.wasadata.net/3053/video/Ytcirkulation.WMV
The difference is that the pH-controllers magnetic valve is on the whole day with the high surface agitation (red curve is magnetic valve on/off):
http://193.12.137.241/bluesboy/pHplott.php?t=2004-12-20
.. and shuts of at certain intervals with the low surface agitation
http://193.12.137.241/bluesboy/pHplott.php?t=2004-10-28

CO2 is more easily absorbed under the leaves.

CO2 is more easily absorbed when the water circulation reduces the boundary layer around the leaves.

=> Spraybar should be placed down in the back shooting forwards the front glass (No surface agitation, CO2 from downunder, Even circulation reducing the boundary layers)

Thanks to Jan Thorstensen (http://193.12.137.241/bluesboy/blog.php) for his excellent movie and pH-plots.
 

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There will be some CO2 in non-CO2-tanks. The importance of keeping the badly needed CO2 in a non-CO2-tank should be higher I guess.

You want the plants grow. If the plants grow the net carbon-gain (photosynthesis) is higher than the respiration-carbon-loss (oxygen intake).
 
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