Good thread!
Thinking about this treatment myself, so had to read the whole thread. Had a few thoughts after reading....
Stabilizers
One interesting quote from
here after I searched for
hydrogen peroxide stabilizer:
"Drug store/grocery store grade hydrogen peroxide, available in a 3 percent solution is always stabilized to increase shelf life of the product. For this reason it is not an appropriate solution for use in food preparation or the cleaning of food preparation surfaces or equipment.
[....]it is well known that the most common stabilizer of H202 is acetanilide. Other agents known to be used as stabilizers include phenol, tin, Colloidal stannate, organophosphonates, and nitrate."
I know I don't want to add phosphates or nitrates along with my "cure"! And I doubt that adding phenol, tin, stannate (?!) or acetanilide will do the tank any good either.
Sounds like
food-grade h2o2 would be highly recommended, in spite of the shorter shelf life.
Not sure I have access to food-grade h2o2, but will ask the pharmacist/druggist/chemist if I can't find it on the shelf.
Light + H2O2
I also wanted to repost a great PDF (dated 1984!) from the Aquatic Plants Management Society (APMS) that someone linked near the beginning of the thread, but that was apparently ignored (or at least not used or referenced) by everyone...perhaps because the title wasn't posted.
Here's the link (PDF) with the title:
Of the people who had less luck with h2o2 treatment, I think there are two likely causes:
- The black-outs that were frequently used throughout the thread as a co-treatment.
- Lots of folks seem to dose at night.
Both would eliminate, or dampen, the photo-enhancement effect.
It's been mentioned that there could be an odd-ball dinoflagellate species at work which happens to be immune/less susceptible to h2o2. But according to the observations
@Pants has been making, there seem to be only three types at work, so the "odd-ball" theory is dubious at present IMO.
From my interpretation of the APMS link, it appears that the peroxide is quickly (~ 1hr exposure) consumed by the plants in question. This would make for a possible explanation why critters like acans, favia and anemones seem to be somewhat susceptible to h2o2 treatment - they all "inflate" with seawater, or in the case of Favia they polyp out at night. If the seawater happens to be jacked up with h2o2 when they injest it, then the critter probably gets a serious free-radical problem and could suffer the same fate as the algae/plants in the APMS PDF....bleach and die.
Seems like this could be in the Chemistry section.