A local reefer here in town Dosed with H2O2 for awhile to control his hair and other forms of algae and had great success.
Basically if my memory serves me correct, Peroxide dosing is just as but not as dramatic as Vodka dosing, however, if overdosed it will kill off plant life, snails, shrimp and fish. Sea horses and pipe fish included. One does not just pour this toxic agent into the aquarium. With a syringe, apply over or in the algae over a span of 5 minutes. Waite 48 hours and reapply as needed.
60ml's of 3% and 15ml's of 9% of peroxide.(55gallon tank)
I did not take the time to read Henry's links but I'm sure they gave the recommended dosage amounts per % of H2O2.
Peroxide dosing can also be used as an Antibacterial agent for the fish in the aquarium but the stress on the fish may be to overwhelming to catch and treat. I would only recommend doing so in extreme emergencies and pending on condition of the fish. Peroxide can also be used to kill off Nitrifying bacteria but kills off good bacteria as well.
People have also used in substitute with bleaching a new/used tanks and equipment for aquariums, (hosing, pumps, sumps).
the good thing with H2O2 is it dilutes into water and Oxygen in the tank, but like stated above, will also kill if overdosed.
sorry so long and I hope that i didn't hijack the thread....