When or how often should I change my filter cartridges, I just realized I havent since I got my 55g up and working, which was like a month or two ago. I have 4 RBP'S all about 2 1/2 - 4 inches in length. Thanks Guys
it usually says on the packaging how often you should change them, i think on mine it says 3 or 4 months, but i rinse one of mine out every other week or so. i only rinse one of the 2 so the bacteria will still be in the one, and by the time i rinse the second one, the first one will have the bacteria again
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