.................if you have adequate flow across the substrated then you are not going to get a build up of phosphates--they will be kept in the water column and filtered out.
---and remember the phosphates the phosphates came from in the first place--probably over feeding 
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I prefer my substrates stirred but not shaken
Current Tank Info: 150gal long mixed reef, 90gal sump, 60 gal refugium with 200 lbs live rock
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