So iv just finished treating my 125 gallon. I dosed 4000mg in it to rid myself of horrible gha. After the treatment I would say my gha is 85% gone, the places it's left are all in low light areas so adding some lights to shaded areas may be a good idea for really bad tanks. Almost everything in the tank seemed unaffected by the medication, I did lose my sea hare on day 14 but am not sure if it was related or not. He had been eating the dying algae at a much faster rate than I had ever seen before, seemed like it never even slept during the last week so maybe he overdosed on it or maybe he was older than I thought and it was gonna happen either way. I did also lose a acan during treatment but again I can't say it was due to the fluco because all other coral seems unaffected. What I can say though is this product works and works very well. Iv been struggling with this gha for months and it really seemed I was going to lose the fight. Definitely gonna be buying some more as a back up and will be shouting this from the roof tops.
Day one:
After treatment: (and some new sand)