This article is from the ReefKeepers FAQ, by several authors (see the Credits section).
Phosphates, along with nitrates, are a primary nutrient of algae.
Tanks with "high" levels of phosphates tend to be infested with
hair algae. All authors cite zero ppm PO4 as a good goal. An
upper level 0.1 ppm is recommended by Tullock (1991) with less
than 0.05 ppm given by Thiel (1991).
 
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