Penn Plax (3 Pack) Cascade Power Aquarium Filters Bio-Sponge;
Penn Plax (3 Pack) Cascade Power Aquarium Filters Bio-Sponge

Replacement Bio Sponge for the Cascade Hang On 150 and 200 power filters. Sponge is ideal for growing beneficial bacteria.

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Replacement Bio Sponge for the Cascade Hang On 150 and 200 power filters. Sponge is ideal for growing beneficial bacteria.

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