I don't believe that is bryopsis. For those that are combatting it, the Tech M does work. It took me two attempts before I was successful. It didn't kill it, but it stopped it from returning when I weeded it, so I feel that it worked!
Just FYI, the guy that made the Tech M "proprietary" blend also made the Brightwell stuff, and so both are alleged to work. There is some ingredient in them that isn't found in bulk products, and so generally, the bulk stuff doesn't work well in dealing with bryopsis.
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