I have not I will keep running GFO until the screen is completely covered in algae. Since the algae can remove phosphate faster than the GFO I decided to let it be for now. As far as phosphate I have not ever had a testable amount so I have not seen an increase or decrease.
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180. SRO 3000INT w/ANC. Fluval SP4. Gyre. DIY LED's/T5s. Apex. Bluefish. Clams. Tangs. SPS.
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