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Black stuff might be cyanobacteria. For that, I'd recommend a week or two of aggressive daily manual removal, followed by chemiclean treatment (or erythromycin), a 3-4 day blackout (wrap the tank), manual removal of any remaining, and finally, a large water change.
Doing just one thing doesn't usually work. I have found that cyano (and dinos) need to be weakened before delivering the knockout blow. That's what worked for me.
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As many naturalists and environmentalists have suggested, we should set aside our arrogance,
our desire to conquer and control everything, and walk hand in hand with Mother Nature. -Walter Adey
Current Tank Info: 180g Seagrass Sandbar Lagoon, START DATE November 28, 2018
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