Professional External Canister Filter Media, 2 pk, Medium, White Pad, Fits 250/350, Specifically cut for use with Hydor Professional Canister Filter 250 or 350 By Hydor - Walmart.com
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Diffusion filter for P·2, i·2 - wide, external
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2-6 Grids Aquarium Filter Box Fish Tank External Filter Box Hang on Filter Box Acrylic External Hanging Water Purifier,Transparent - Walmart.com