This is the result of the metabolic processes and breakdown of organic compounds by the bacteria living on your live rock. Ideally, you should have sufficient random oscillating current that will scrub your live rock and blow this off. However, that is very unlikely in the home aquarium. As such, you should use a small powerhead and blow it off the rocks to be suspended in the water column and removed via mechanical filtration such as a filter sock. This should be done at least monthly during your waterchanges. If this stuff is not removed it can form a substrate which algae can anchor in and use as nutrients. Additionally this basically creates a barrier on that live rock and that area that is sufficiently covered cannot continue to process waste in the aquarium.
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