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OK, I'd watch the corals closely, some might not like a rapid drop in phosphate ; might think about dropping the gfo and/ or reducing the carbon dosing amount for a time if needed. Keep an eye out for bacterial accumulations, snotty pink stuff and/or cloudy water
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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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