Yes it does. Most folks aren't dosing enough, and thank goodness they don't because it's not at all safe for fauna.JLudwig said:Why doesn't dosing peroxide [...] directly to a tank help?
Six months ago, my 20G was infested with a HEAVY HEAVY infestation of numerous species of algae; the worst of which is BBA. I really didn't feel like tearing everything down and bleach so I did the 2nd best thing (the first is of course being patient and do the nutrient control route ): (1) removed all fauna and (2) dumped ~300 ml of a 3% H2O2 solution (Kroger brand). Within 3 days, all the algae either disappeared or turned white. The plants did not seem to be majorly damaged, except for the mosses/liverworts and the H. zosterifolia had black edges. Did several 50% water changes and lowered light intensity for the next few days to avoid triggering a green water bloom. Afterwards, all the plants resumed photosynthesis as if nothing had happened. I also waited 2 weeks after treatment before adding back the fauna just to be on the safe side.
Now folks, don't get the wrong idea and start dumping H2O2 into your tank because you will surely kill all the fauna and possibly trigger a green water bloom. The point of this post is to point out that H2O2 works if dosed in a high enough concentration and that it's a more convenient alternative to tearing down a tank and bleach everything.
THE FINE PRINT
I would like to point out something very important Mr. Ludwig noted earlier: "Focus on growing plants not on preventing algae..." While we currently do not know why and how algae appear/persists but there exists a clear correlation: healthy plants => less algae. So the cheapest and most effective method of algae control is to grow healthy plants. You cannot be a successful aquarist w/o realizing this IMO.