I honestly haven't really put much thought into what could happen if you don't clean filters for a while.. I haven't cleaned my aquarium filters in months, they still work, and are probably filled with that brown bacteria gunk attached to my filter polyesters battling.. So I was wondering if there are any problems with leaving a filter unattended for a while, like MONTHS. Besides clogging issues and some water output slowing down. Should I be concerned about any bad bacteria taking advantage of organics, and parasites taking foothold in the filter medias or w/e?? Should I not be lazy, and really be doing filter cleaning once every two or four weeks to remove sludge or can I just leave the filters be? Can I use the sludge for garden plants? I'll be using Rid-X soon to help reduce the build-ups.