my experience is also the same. Here is 35% addition, habituated the entire system with the stenopus as well to brief drain and treats. got mean in order to beat gelidium algae, and mean sure worked. I documented a blast run of say three mils 35% onto a mushroom coral, totally immune, and another few mils pumped here and there for general spot runs. id leave drained say 15 mins cooking, refill, then wc again then one last refill and doing this slowly adapted my entire reef at 9 yrs old to powerful peroxide only to see how strong it could take. nearly all online work, and results, are off 3%
safety
the 35% is a big deal. instant corneal blanching of the eye, no second chance, is a must for goggles. If you get some on your hand you'll be fine and that will self correct soon enough... But for eyes you just cant play.
its avail at healthfood stores to anyone, so its not like back alley chem lol they sell it as a bath additive to soak in.
its not necessary in 99% of jobs, 3% is ok. This is for misbehaving invaders and experimental notes only but I was willing to put my old pico reef on the line to test peroxide predictability.
the video doesn't imply peroxide is right for all or any issues, its more a demonstration of known tolerant species being adapted to their max oxidizer tolerances. the 3% work safety margin is nicely highlighted by a much stronger 35% run, this starts to ask what are the true upper limits for exposure imo
and the side effect was zero algae heh, its 35%: