The Planted Tank Forum - View Single Post - The "One-Two Punch" Whole Tank Algae Treatment
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Old 02-07-2013, 12:36 AM   #89
DarkCobra
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Hey Zorfox, thanks for the report!

Algae not initially killed will, for a time, adapt by producing more of its natural defenses to both H2O2 and Excel. So each successive treatment will be a bit less effective. Best case scenario, it will require more than 3 treatments at 1/3 dose, to get the same effect as a single treatment at full dose. Worse case, the algae will grow sufficiently resistant that you have to increase dosage or frequency to see substantial continued improvement.

That's why I prefer to use the largest H2O2 dose I can reliably get away with, and a sudden spike in Excel rather than continuous overdosing. Still, "chipping away at the stone" can work too. If you prefer to proceed this way, I encourage it, and would love to see future updates.
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