It was recently reported in a R2R thread and confirmed through a number of sources that Lithium is the compound within Tech M that kills bryopsis.
http://reef2reef.us7.list-manage.com/track/click?u=575b41be57d360bc9434b674a&id=6bb305d499&e=ac9bca459f">http://reef2reef.us7.list-manage.com/track/click?u=575b41be57d360bc9434b674a&id=6bb305d499&e=ac9bca459f</a>
It makes for interesting reading.
http://reef2reef.us7.list-manage.com/track/click?u=575b41be57d360bc9434b674a&id=6bb305d499&e=ac9bca459f">http://reef2reef.us7.list-manage.com/track/click?u=575b41be57d360bc9434b674a&id=6bb305d499&e=ac9bca459f</a>
It makes for interesting reading.