guess my point is, unless you figure out what it is that is causing your flare ups you will likely be having an on going war with the bryopsis....raising your Mg will work to help get rid of it , but having your Mg that high throws your water chemistry way out of balance..... you should try and think about what is at the "root" of the problem
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260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065, 2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa).
http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here
http://www.vimeo.com/2304609 and here
http://www.vimeo.com/16591694