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They might consider that the skimmer removes enough particulates. The recommended turn over is minimum 10 x tank volume, so the volumn of particulates running past the skimmer is high. Also, in this case, the particulates are seperated from the tank water rather than sitting in a sock in the water. Any particulates not caught can be consumed by the tank critters, breaking them down into inorganic nutrients to feed the algae.
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