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Fluval Biomax Rings for External filters fit perfectly into Aqueon's Quietflow 20 external media tray. Definite improvement over stock. Still not my favorite filter, but is better now. : r/Aquariums
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Fluval AquaClear 20 Backfilter Nylon Filter Media Bags 2 Pack - in Grandville, MI - Blue Fish Aquarium
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Amazon.com : Fluval Universal Media Filter Bag, Pack of 2 : Aquarium Filter Accessories : Pet Supplies
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