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PMDD dosage

I have been using the most recent version of the PMDD for approx. 5
weeks now at 4 ml per day.  To date I am still showing no signs of
iron, nitrates, or phosphates, as well a nice healthy batch of green
algae has developed blanketing some gravel and my slower growing
plans. Most of my plants are showing good growth.  I think the algae
is due to insufficient nitrate????   My question is do I increase my
dosage of the PMDD?  With added KNO3?

My tank parameters are:

90 gallon
hardness of 4.5
Ph of 6.8-7.2
300 watts of light
79 degrees 
no substrate additive

Thanks for any suggestions.

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