Brad I like that idea. I think the downward suction is also due to the distance between baffles 1 and 2. The area of that gap determines what sort of pressure is created there I think. I'd use a greater distance between 1 and 2 and then experiment with lowering baffle 1. I think the horizontal distance will have more effect. As it is you are letting the bubbles get farther away from the surface as well so in my opinion a combination might be more effective.
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