Penn-Plax Replacement Media (2 Pack) – Fits Multi-Pore and Undergravel “E” Filters – Provides Chemical Filtration (FC2) COMVITA The Electric Heating Mat for

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Penn-Plax Replacement Media (2 Pack) – Fits Multi-Pore and Undergravel “E” Filters – Provides Chemical Filtration (FC2) COMVITA The Electric Heating Mat forFeatures: REPLACEMENT FILTER MEDIA: These Cartridges are made to fit the lift tubes of Muti Pore and Undergravel E filters, serving as a replacement for when its time to cycle out aquarium filter media. We recommend replacing them once a month. TOP QUALITY CARTRIDGE: Cartridges come together in a 2 Pack. For best results, replace cartridges every 2 to 4 weeks. Theyre lightweight, disposable, and are safe for Freshwater and Saltwater aquariums.