View 2 of **TWO PACK** Penn-Plax Cascade 300 Filter Replacement Bio-Sponge (1 Sponge) – Provides Filtration for Freshwater and Saltwater Aquariums

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View 1 of **TWO PACK** Penn-Plax Cascade 300 Filter Replacement Bio-Sponge (1 Sponge) – Provides Filtration for Freshwater and Saltwater AquariumsView 2 of **TWO PACK** Penn-Plax Cascade 300 Filter Replacement Bio-Sponge (1 Sponge) – Provides Filtration for Freshwater and Saltwater Aquariums