I have been reading about H2O2 and I read that in small amounts added to the tank (making the h2o2 heavily diluted in the volume of tank water) that it does nothing but highly boost the oxygen levels in the tank.
I read "many a fish store owner has added hydrogen peroxide to their systems during a power outtage'
Maybe not an exact quote, but I wonder what any fish store owners have to add on the subject?
I've never done it, just throwing it out there for someone else to confirm