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Sharpey: If your algae declines, do not assume the small plant filter was the cause. Algae blooms usually decline after the water warms...it is a seasonal cycle of pond life. More interesting would be testing for nitrate levels, assuming water changes remain at the same rate as during the cooler months of the year. I think you will find the bog plants thrive, but the nitrate levels are not apprciably affected by a few plants.
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