The only ones not affected, (as you posted), are the ones with the enzyme catalase.
That said they are few in number respectively as it relates to freshwater aquariums.
http://www.plantedtank.net/forums/sh...1&postcount=25
Considering the poster only dosed to 6ml/g and reported an ammonia spike shortly after I would think the enzyme is lacking from the bactors we prefer to protect in our tanks so caution dosing H2O2 has some merit I think.
I wouldn't consider all aerobic bacteria to be protected,