Hydrogen peroxide newbie

I've been using SUPERthrive Zyme for a couple of grows now and my brown algae problems are gone. I dont know whats going on there but it works.
I run an ebb and flow system but I would think it would work the same.

When I see hypochlorous acid and 50% H2O2 in the same thread it gives me the heebie jeebies . Don't mix the two .

Old Person said:

I use "Power Si" in my res with h2o2……no problems. It is reccommended to add ‘Power Si" first.

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Doesn't the h202 just kill everything?