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There is one guy on this thread who showed a photo of his unit that had some baffles to create turbulence... from the Adey book, there is no indication that they thought the algae benefited from a dry spell... the point with the surge was more to loosen up the clumps and allow water to flow and disrupt the boundary layers that lead to dead spots within the clumps... Baffles might be enough to do the job, as with that unit in the photo...
Algae growing on the sides of the box is another story... one might have to use, lo and behold, an algae scrapper to clean it out...
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