The implication seems to be "add more excel and alage will suffer even more".

*snaps fingers* Redox! Flourish Excel has a reducing agent in it that
reduces iron to Fe2+, an oxidizer. Algae are sensitive to peroxide and
permanganate. Fe2+ is an oxidizer and reduces itself back to Fe3+ in
water by donating an electron to a water molecule, making HOO-, which
rapidly combines with H+ to make hydrogen peroxide.

Yeah, I thought that too:

"There is no residual H2O2 from Flourish Excel use. As I mentioned in my
previous e-mail Flourish Excel will not degrade to yield peroxide.

-Greg Morin

--

Gregory Morin, Ph.D. ~~~~~~~President/CEO~~~~~~~~~~~~~~
Seachem Laboratories, Inc. www.seachem.com 888-SEACHEM
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"


But, I think you're on the right track. These things inhibit/kill algae:

Excel
Fast growing plants
Peroxide

What do they all have in common? They raise the redox potential.

Algae favours stagnant water. Oxygen would seem to do it in.

I think I notice less alage in tanks whose sponge filters output
2'3" above the water line compared to those that bubble it out AT
the water surface. But I only see this in a couple of tanks so
I can't really be certain. Just another data point.

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