I prefer the media options on the AC over any cartridge filter. You will quickly get the $20 difference back by just rinsing the sponge rather than replacing cartridges.
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On my aqueon 30 and 20 that I have, I use a cut out piece of that blue filter media. When clogged I just rinse out in tank water. I also re-use and don't have to buy cartridges. I'm guessing the 55/75 can work the same way
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