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I also think we are focusing too much on the air water interface, and getting enough "air" to the algae... if the water is saturated with )2, as it should be, then it is also supplying enough CO2 to the algae, and more or less wont make much difference, and certainly light is more important in accelerating the growth (and thereby the filtration) -- the surge is not intended to provide more "air" but rather to stir up the algae so that it does not matt down and not get as much light and water flow as it should... it is not so much about air or CO2... that focus I think is missing the point...
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