Kim,
I'd increase about 100ppm per day. I'd imagine your current level of Mg is around 1300-1400 ppm. Just increase it to about 1800 ppm and see how the bryopsis is reacting. Typically, it will stop growing and then over a period 2-3 days will begin to turn clear. Remove what you can and I would maintain that 1800 ppm for about 2-3 weeks to be safe. Afterwards, just do a series of water changes until your Mg gets to a concentration that is closer to natural sea water.
I have left mine at 2100 ppm with no ill effect other than the some of my montis faded and some of my snails have problems hanging on to the glass while resting. I don't intend to keep it this high but since I am moving to a new tank, I'd thought I'd save the water changes for when I fill out the new tank. Good luck and let me know if you have any questions. Remember to shake the bottle well before dispensing.