Yes it does.
Most folks aren't dosing enough, and thank goodness they don't because it's not
at all safe for fauna.
Well, by this standard bleach also is an effective algae control reagent. If peroxides are needed at levels that are harmful to fish to suppress algae, I really doubt plants/or barely straw are using this mechanism... Let me rephase, why can't I dose small non-lethal levels of H2O2 or ozone to suppress algae? If you have direct evidence for this in a controlled experiment, I'll be more than happy to change my views.
I should explain why I'm being a bit of a pill here... There is a lot of unsubstaniated scientific nonsense in this hobby, and I aggressively go after people who promote these viewpoints. The current truth of the situation is that there is no viable and tested explanation for why a bunch of plant growing happily keep algae from appearing
. This point is not made enough, and it is something everyone new to the hobby should know. This fact encourages experimentation and exploration of variables/new techniques and creative DIY alternatives. Stuff such as "O radicals inhibit algae growth" sends people down the wrong road of experimentation, for example my hypothetical technique of peroxide dosing.
Advancing a viewpoint such as oxygen free radicals (this one is a pet peeve of mine, sorry) inhibiting algae growth, stated as a matter-of-fact without any experimental confirmation is not only bad science, but irresponsible. Its this know-it-all attitude that kept me on a cookbook approach for way too long and really held back my success as it kept me from experimenting on my own, thinking the whole time I was doing something wrong within the technique. There is no answer, and at the end of the day, "Focus on meeting plant needs" is much better science than SWAGs about root causes of algae inhibition. Barley straw, until tested experimentally by a third party in a controlled experiment, is bad science and nothing more can be said about it right now.