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Package includes: 12 pcs black aquarium filter pads. Good for freshwater & marine environments. Provides efficient water flow with less clogging for

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3IN1 Aquarium Filter Sponge Foam Pads - Filter Media For 20 Gallon Betta Fish Tank Supplies, Brine Shrimp Coarse Sponge Bio Filter Sheet - Filter Sponge Accessories (Plus Activated Carbon)

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Gallon Fish Tank Filter

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Advise: Replace the bio-sponge three month, to ensure the filtrating effect as well as the growth of the nitrifying bacteria.

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