I've used it for bubble algae/GHA removal from zoa and acan frags, it worked great. The coral HATES it, but survives. Be careful dosing, data is still scarce.
I use 50% for five minutes. Roughly. I haven't lost a coral yet in 3-4 tries but I'm sure I will eventually. Thing is, I'd rather risk losing a frag than introduce a pestilence into my tank.