I did do a treatment for Dinoflagellates about three months ago running Mag at 1500-1550 for about 30 days. It took care of the dino and bryopsis. Looking back that was unexpected and never put two and two together until reading your post just now.
The bryopsis that is currently in the frag tank came from DR Fosters and Smith frag about 1 month ago. Cant believe how fast it has grown and lucky it did not make it to the display. At least not that shows anywhere yet...... Good to know that if it does I can elevate the mag levels again because manual removal is difficult.
Come to thing of it, the turf algae is gone as well, wonder if Mag levels took care of that to?
Also have since nice green and red bubble algae. It does not bother me to much because blends in with the purple/red rocks. Kind of cool looking and easy manual removal. I like to pop them.... Whoaaaa don't know where that came from, just blurted it out. Some nice aloe stuff comes out to moisturize the hands.
come on now you all cant tell my you dont pop your bubble algae to see what is inside. You just cant help it is like trying to hold bubble wrap in your hand and not pop it.
BTW: There was no ill effects that I could see from the short increase in levels.
Lazy, have you looked into magnesium treatment for byropsis?