I just caught up on the thread, Great info by Mike, and good job on ceasing to dose from a bottle.
We are all keeping a part of nature in our home and we need to let nature take its course with some assistance from us, it is generally known that solutions in a bottle may temporarily resolve a problem but will generally lead to another problem, then in goes another solution and another and before you know it your part of nature crashes.
IMO, reduce your lighting intensity and duration, still ramp it up to 100% but only for an hour a day, then keep it at 60%, only run the lights for 8 hours a day, and total darkness for 3 hours per night. you won't achieve coral growth doing this but I guess at the moment that isn't the main focus.
What I also I recommend which others wouldn't but has worked wonders for me is SCRUB, get it off your rock, and after you have scrubbed, siphon your bottom, suck up some sand if you have too, then change your pre filtration Immediately, and do this everyday. At the moment your outbreak is chewing up all your excess nutrients which is helping them to grow and stopping other algae from growing, when you have spent a few days or weeks scrubbing and eliminating what's in your DT, you should start getting other algae starting to form on your LR including coraline. then your problem has a problem, competition!! Once you reach this stage it should be smooth sailing!!
it is fact that disturbing the substance will cause bubbles which contain spurs, but when I scrubbed, siphoned and changed prefiltration, didn't cause me any issues and helped my situation remarkably.
Good luck, don't tear your tank down, your don't need to, I do on the other hand, ich outbreak and too much rock and coral to catch them, so tonight out it all comes, fish in QT, and then it all goes back in! Fun fun!!