Im on my second attempt as the 1st time caused issues with some corals and it came back after a month. I did things differently this time, im going on 2 weeks now and its going smoothly and im gonna keep going for a month. This time i started with half the recommended dose, took the skimmer offline for only one day, pulled out the bag of gac, and left in the bag of phosgaurd. 6 or so days in all visible signs of bryopsis where gone and 2 weeks in my mixed reef tank inhabitants have not shown any signs of suffering from the treatment. Just wanted to share my current experience versus the last time with the changes i did this time around.