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P doses reducing algae?

    I've seen mention here of people who were dosing phosphate into the water 
column of tanks they suspected were too P limited, who found that one benefit 
was that the algae film on their glass grew more slowly.  I was wondering if 
they would share some details?  Has that benefit continued?  Have you 
continued to dose that way?  Did the film initially get worse before it got 
better?  Did the color of the film change?  Do you find the color of the 
film, or it's growth rate to be a helpful indicator for your P dosing?
    Thank you,
    Zach K