I have this particular pink birdsnest frag that has stubborn bubble algae that keeps coming back despite best effort to scrape off the bubble algae (out of tank).
While we know that zoanthids in general are tolerant of diluted hydrogen peroxide dips, the general belief is never to let Hydrogen Peroxide (H2O2) touch SPS. As a last resort, I dipped it in about 0.3% H2O2 for about 1-2 minute after manually removing as much bubble algae as possible. You can see the frag bubbling away.
That frag was dipped on 4th April. Its alive & growing well today
Some will take the safer route of using Vibrant.
But if you have just an isolated case & want to use H2O2, its at your own risk.
Best to 'test' with a small frag ahead of time. Below is the dilution recipe for 3% H2O2 to 0.3%. Add 10ml of H202 (3%) to 90ml of RODI water (to make a final volume of 100ml).