The filter should be cleaned every single 6 months. When cleaning your filter only exchange the sponge/cotton material and don't rinse out or adjust any of the opposite media during the filter. A clean up and appropriately-managed aquarium is far more visually beautiful and pleasurable to take a look at. https://messiahcmtbh.blogprodesign.com/58306372/aquarium-care-uae-no-further-a-mystery