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Amazon.com : Penn-Plax Clear-Free Premium Under Gravel Aquarium Filter (UGF) – Freshwater and Saltwater Safe – Suitable for 20 – 29 Gallon Tanks : Aquarium Cleaning Supplies : Pet Supplies
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Amazon.com : Penn-Plax Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – Two 11.2” x 11.25” Plates – Under Gravel System for Clear, Clean Water – Safe for Freshwater and Saltwater Tanks :
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