I dunno what he is on about... I know it works so I guess he can say what he likes.
I used to do the same basic thing using sunlight and small scissors to trim the massive algae growths until I read Bomer say this was better somewhere. He was right, this way is just as effective if not a bit more so. A little slower likely, takes more water, but sure is less work overall, and the end result is a cleaner rock.
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Benjamin
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