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[APD] Algea bubbles

When I have the CO2 and nutrient-levels on target I notice extreme 
bubbling from algae attached to my driftwood near the light down to a
very special depth where the bubbling radically declines in intensity.

But now the bubbling has stopped and the algae amount has
declined and/or turned whitish. Some bubbling still occour after 
the the threshold depth, see movies.

What's this about? Why the threshold, and why have it all of 
a sudden stopped bubbling and turned somewhat white?

Have I "overdriven" the algea above the threshold?

WMF format 745 kb:
RealVideo format 496 kb:

// Daniel.
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