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I don't think so if it's truly 1ppm . You could try a bit of sodium nitrate,say 1/3 tsp for your 200 gallons to see if it helps bring the PO4 down. O.07ppm PO4 isn't terrible and might adjust on its' own
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Tom
Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
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