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Please share here your preferred method, when it comes to using GFO (Granular Ferric Oxide) . Do you run 24/7, intermittently or never? Leave some details about your system (age of your reef, size of your tank, type of coral, what reactor you run, what you feed, substrate or none) and reason for running GFO, the way you do.
My tank is a 4 year old 120 gallon, SPS heavy, mixed reef and it seems to do best running 3/4 cup of regular GFO 24/7 (not high capacity) in a reactor, swapped out once a month. It keeps my PO4 level right where I like it. This may have something to do with the 2" aragonite substrate. It does get stirred and maintained. Visually it is what works for me and I personally prefer to have some phosphate in the water to reduce with the GFO, rather than having to add something to increase the PO4 levels. I am not a heavy feeder, using mainly aquanix cool green flakes and nori, which are both also a source of at least some phosphate. All said, I am happy with how this system is dialed in and have no plans to change anything, but am curious about how others are managing GFO usage.
My tank is a 4 year old 120 gallon, SPS heavy, mixed reef and it seems to do best running 3/4 cup of regular GFO 24/7 (not high capacity) in a reactor, swapped out once a month. It keeps my PO4 level right where I like it. This may have something to do with the 2" aragonite substrate. It does get stirred and maintained. Visually it is what works for me and I personally prefer to have some phosphate in the water to reduce with the GFO, rather than having to add something to increase the PO4 levels. I am not a heavy feeder, using mainly aquanix cool green flakes and nori, which are both also a source of at least some phosphate. All said, I am happy with how this system is dialed in and have no plans to change anything, but am curious about how others are managing GFO usage.
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