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12/30/2007, 11:01 PM
reefkeeper2
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Join Date: Mar 2001
Location: Bridgewater, MA
Posts: 457
The GFO will eventually get exhausted. I replace it every 6 to 8 weeks depending on PO4 levels or how the aquarium looks. If I see algae growing on the acrylic just two days after I have cleaned it, it's time to change the GFO.
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