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filters are good if you clean them like aadler said but it needs to be a ritual cleaning proccess. you for get to do it here or there and waste starts to build up and you will get spikes of amonia and nitrate problems causeing the bacteria in your rocks and sand to try and get it out but they are not used to proccessing that much waste so in turn things in your tank will start to die off. so if you are keeping the filters make it a ritual to change and clean the cartrigaes.
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