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The importance of a pre-filter sponge. Not even one day after a WC. Only a betta, tetras, and pleco. : r/Aquariums
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Amazon.com : SHIGATSU Aquarium Filter Floss, Upgraded 8-Layer Aquarium Filter Foam Sponge for Fish Tank and Pond(47" x 12")- Aquarium Filter Media : Pet Supplies
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