PolypLab Genesis Rock - 4 Pack PolypLab Genesis Rock - 4 Pack is a set of high-porosity ceramic bio-blocks for increasing biological filtration capacity in freshwater or saltwater aquariums. Each block provides a compact colonization surface for beneficial bacteria, helping support nutrient processing and long-term water stability. Genesis Rock Bio Media for Sumps and Aquascapes Genesis Rock blocks can be placed in a sump, refugium, overflow area, under substrate, or hidden within aquascaping where water can move through or around the media. The ceramic structure is designed for long service life and provides a practical way to add biological filtration without bulky media baskets. PolypLab Genesis Rock Features 4 pack of ceramic biological filtration blocks. Designed for freshwater and saltwater aquariums. High-porosity fired ceramic structure supports bacterial colonization. Helps support nutrient processing and water quality stability. Can be used in sumps, refugiums, overflow boxes, under substrate, or within aquascapes. Compact block shape is easy to place in tight filtration areas. Pairs well with PolypLab Genesis bacterial supplement. Genesis Rock Specifications Product type: Ceramic biological filtration media Quantity: 4 Genesis Rock blocks Material: Fired ceramic Approximate block size: 4 in x 4 in x 1 in System compatibility: Freshwater and saltwater aquariums Placement: Sump, refugium, overflow box, substrate area, or aquascape Compatibility Notes Genesis Rock can be used on its own after rinsing or pre-seeded with a bacterial supplement before placement. Choose the location based on the desired filtration style: higher-flow placement for aerobic activity, lower-flow placement for anaerobic zones, or moderate-flow placement for general biological filtration support. Directions for Use Rinse the Genesis Rock blocks with purified water or aquarium water before use. For pre-seeding, place the blocks in a container of aquarium water with a bacterial supplement and allow them to soak before adding them to the aquarium. Place the blocks where they will receive appropriate water movement for your filtration goal. What's Included 4 PolypLab Genesis Rock bio-blocks