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Sv: Aquatic Plants Digest V3 #821

This I consider one of the more wise approaches in fighting BG algae,
G-algae supposed to be a sign of the highest possible state of oxidation
 electro-chemical), this meaning very "pure" water, while BG´s considered a
sign of a lower state of oxidation.
BG´s being a pest, and it seems to me, with my short experience at the list
and at the NG´s, mostly to those using "substrates" and different
"additives" :-).
While not wanting to restart a discussion of the sense in using broad
spectrum antobiotics in fighting BG´s,  the use has made me wonder since
other methods without any use of potential harmfull chemicals are available
and well known.
Hückstedt advocates 1 cmm 15 % H2O2 per 20 L of water (and considers twice
the amount not harmfull)
when fast-checking for ammonia - or CO2 poisoning or for lack of O2. At the
Max-Planck institute he made a lot of interesting research on the the issue
of reduction/oxidation and the effect on algae and on the toxitivity
of many of the usual contents common in FW and SW tanks.

Louis, I consider this interesting. Will you please inform me of the
concentration of H2O2 and when further results,

>Date: Tue, 02 Feb 1999 16:57:11 -0500
>From: Louis Lin <lhclin at aw_sgi.com>
>Subject: Hydrogen Peroxide vs. cynobacteria (long)
>Recently I've been experiementing with hydrogen peroxide as
>a non-antibiotic treatment for cynobacteria.  I've been looking
>through the Krib and the APD archives.  From the past discussions
>(started by August Eppler), the use of hydrogen peroxide to
>combat cynobacteria seems very experimental.  So I hope my
>anecdotal experience can be helpful to others.
So I decided to give hydrogen peroxide a try.
>(Interestingly, phosphate was undetectable).
>To test out hydrogen peroxide, I applied a little bit of it onto a patch
>of cyno using a turkey blaster.  Contrary to August Eppler's report
>in the Krib, bubbles almost immediately came up from the cyno.
>The next day, that patch of cyno lost its slimyness and I assumed it
>was dead.
>I decided to try a higher dosage.  August Eppler's friend used 2 oz
>in a 10 gallon fishless tank, but I was worry about the shrimp and
>snail.  So I used 4 oz, again spot treat using a turkey blaster.
>Most of the cyno looked dead the next day.  Unfortunately, so were
>many shrimps and snails.  In the second day, I reduced the dosage to
>2 oz.  I also used the turkey blaster to blow away whatever cyno that
>was remaining on the plants.
>More cyno, shrimps and snails death in the third day.  I further reduced
>the dosage to 1 oz.  In the fourth day, almost all of the cyno
>I didn't count the shrimps and snails, but the lost is probably minimal.
>There wasn't much snail and shrimp left anyway.  It looked like I
>have reduced the cyno population to a level that the plants can compete
>well, and I stopped the treatment.
>The plants took hydrogen peroxide quite well during the treatment.
>Everything looked good except some tender new leaves of
>Hygrophila polysperma.  The new leaves of H. polysperma seemed
>to be weaken (not killed) by the hydrogen peroxide.
>I also measured ammonia during the treatment.  No ammonia was
>detected, but this was fishless tank.  Therefore, it is inconclusive
>on how hydrogen peroxide affect the bacterial filter.
>I didn't exterminated the cynobacteria.  I can still see tiny bit
>of it in the tank but it is not growing.  It is not my intention to
>exterminate it anyway because inevitablely, cyno will be
>re-introduce by new plants.  The idea is to reduce it to a level
>that higher plant can compete well.  Hydrogen peroxide treatment
>has achieved this goal for me.
>In summary:
>- - Hydrogen peroxide is an effective treatment for cynobacteria
>   with little affect on plants.
>- - As for the amount used, 4 oz per 35 gallon (minus substrate)
>   spot treatment is already effective.  That's roughly 2 oz per
>  15 gallon.
>- - There doesn't seem to be an effective and safe dosage level
>   for snails and shrimps, and possiblely for fish.