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Could I use an old HOB filter for phosban media? If I removed the carbon from the bag and replace with phosban media, or should I run both carbon and phosban in the bag? How often should I use the phosban or carbon (if any)? Or could I put the phosban in yhe lower chamber of my HOB skimmer where the water enters the skimmer? I have a bad cyano prob just looking at ways to rid it other then just weekly wc. Thanks