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@ISpeakForTheSeas
My guess would be black bugs (pest copepods) of some variety, but I'm not sure on this one. Any chance of microscope pics?
Pest copepods (red/black bugs of genera Alteuthellopsis, Parategastes, and Tegastes)?
https://reefs.com/magazine/aquarium...measures-and-a-review-of-treatment-protocols/
https://av.tib.eu/media/55499