seachem does not contain the epsom salts, which contain mag sulfate, which is what kills the bryopsis. seachem contains mag chloride. but kent tech M does mag sulfate. I experimented for a while, started with seachem, it did not work, and after reading the whole 200pg thread on RC i read that only people using epsom and tech-m were successfull. so i tried tech m, and it works like a charm. but only on bryopsis, if you have regular hair algae it does nothing.
if you have nothing better to do... read away.
http://reefcentral.com/forums/showth...readid=1113109