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Page 5, Col 2, (c)...

Every coral colony observed [on the natural undisturbed Curacao reef] was interacting with at least one type of alga, with an average of 61 to 80 percent of the coral...

You are forgetting the fact that the corals grew there in the first place, touching the algae, more (at least) thousands of years. The study is about the increase of algae in the last 20 years or so....

Note: Scrubbers are supposed to grow green hair, which is not covered in this study. But many people still think that scrubbers grow turf, and this study does include the amount of microbes related...