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I got an aquaclear 50 yesterday for my 20 gallon tall. I cut half of the filter cartridge from my old one and stuck it in to help seed it as I couldn't fit both of the filters on the back of the tank with the lid fitting. (I have cats so they'd totally jump in or grab fish, I need a lid for sure lol) I'm only wondering because I want to take the old filter part out as soon as possible so I can fit the carbon bag back in. Thanks!