My two eheim 2080 has been running for almost six months now, have not cleaned out anything except changing out the white filter pads on both on the third month. I have recently bought , a media set enough to change one canisters media out. I was thinking of changing and cleaning out half of the media on each canister leaving half of the old and putting in half of the new. I will completely clean out the old media that I am replacing drying it out in the sun and changing the media again maybe every 3 - 6 months. what do you guys think? One way of recycling old media and still maintaining Bio filtration