Dual Double Bio-Sponge Filter

    • 5.5″W x 5.5″H for the Small (Left in photo)
    • 6.5"W x 9.0"H for the Large (Right in photo)
    • Comes in a colored retail box
    • High quality bio-sponge
    • Provides a wider space for nitrifying bacteria proliferation
    • Driven by air pump, increases water circulation and oxygen


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