{"product_id":"polyplab-genesis-rock-pack-4-ceramic-bio-media-blocks-reef","title":"PolypLab Genesis Rock Pack | 4 Ceramic Bio-Media Blocks for Reef Tanks","description":"\u003cp\u003eThe \u003cstrong\u003ePolypLab Genesis Rock Pack\u003c\/strong\u003e is a 4-pack of high-fired ceramic bio-media blocks engineered to host massive populations of beneficial bacteria in saltwater reef aquariums. Each \u003cstrong\u003e4 × 4 × 7\/8 in\u003c\/strong\u003e block is sintered from a porous ceramic compound that supports both \u003cstrong\u003eaerobic (nitrifying)\u003c\/strong\u003e bacteria on the outside and \u003cstrong\u003eanaerobic (nitrate-reducing)\u003c\/strong\u003e bacteria deep in the core — in a single piece of media that lasts for years. Drop them into your sump, refugium, sand bed, or aquascape and let them work. Pair with the standalone \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/polyplab-genesis-bacterial-blend-50ml-live-reef-bacteria\"\u003ePolypLab Genesis Bacterial Blend\u003c\/a\u003e to seed the blocks fast, or browse more reef essentials in our \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/salt-water\"\u003eSaltwater Collection\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eWhy This Pack\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4 Genesis Rock blocks\u003c\/strong\u003e — enough surface area for medium-to-large reef systems straight out of the box.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e23,000+ sq ft of bacterial surface area\u003c\/strong\u003e per block — one of the densest bio-media designs on the market.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e100% high-fired ceramic\u003c\/strong\u003e — fired at 600°+, will not break down or release silicates over time.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAerobic + anaerobic in one block\u003c\/strong\u003e — outer surface processes ammonia and nitrite while the oxygen-starved interior reduces nitrate.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile placement\u003c\/strong\u003e — works in sumps, refugiums, deep sand beds, or hidden in your aquascape.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLasts for years\u003c\/strong\u003e — ceramic substrate does not degrade under normal reef conditions, so you set it and forget it.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow to Use\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eInitial seeding:\u003c\/strong\u003e Place the blocks in a clean container, cover with aquarium water, and dose your favorite saltwater bacteria culture (we recommend \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/polyplab-genesis-bacterial-blend-50ml-live-reef-bacteria\"\u003ePolypLab Genesis Bacterial Blend\u003c\/a\u003e). Soak for at least \u003cstrong\u003e12 hours\u003c\/strong\u003e, then transfer the blocks into your tank or sump.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlacement options:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAnaerobic (nitrate reduction):\u003c\/strong\u003e Place blocks in a low-flow, low-oxygen area — under sand, deep in rockwork, or a quiet sump chamber.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAerobic + anaerobic (general filtration):\u003c\/strong\u003e Place in a medium-flow zone of the sump or display so the outer surface stays oxygenated while the core remains low-oxygen.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpread the load:\u003c\/strong\u003e Distribute the four blocks across both flow zones for balanced biological filtration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eMaintenance:\u003c\/strong\u003e Genesis Rock requires no replacement under normal use. Continue dosing reef bacteria as part of your regular routine to keep the bio-media saturated with active culture.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"border-collapse: collapse; width: 100%;\"\u003e\n  \u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003ePolypLab\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eGenesis Rock Pack (4-pack)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eQuantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e4 ceramic bio-media blocks\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eBlock Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e4 × 4 × 7\/8 in (each)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eBacterial Surface Area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e23,000+ sq ft per block\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e100% high-fired ceramic (600°+)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eUse With\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eSaltwater \u0026amp; reef aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003ePlacement\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eSump, refugium, aquascape, or sand bed\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eBacteria Required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eSold separately — pairs with PolypLab Genesis or any reef bacteria\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eLifespan\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eYears — ceramic does not degrade under normal use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eRecommended Pairings\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/polyplab-genesis-bacterial-blend-50ml-live-reef-bacteria\"\u003ePolypLab Genesis Bacterial Blend 50mL\u003c\/a\u003e — the bacteria culture engineered to seed these exact blocks.\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/polyplab-genesis-rock-booster-set-bacteria-ceramic-bio-media-reef\"\u003ePolypLab Genesis Rock Booster Set\u003c\/a\u003e — smaller starter kit with 2 blocks plus bacteria.\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/brightwell-aquatics-microbacter7-250ml\"\u003eBrightwell MicroBacter7\u003c\/a\u003e — complementary nitrifying bacteria for ongoing biofilter support.\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/salt-mixes\"\u003ePremium Salt Mixes\u003c\/a\u003e — mix fresh saltwater for soaking the blocks during initial seeding.\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/water-testing\"\u003eWater Test Kits\u003c\/a\u003e — track ammonia, nitrite, and nitrate as the bacteria establish.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the Pack include bacteria?\u003c\/strong\u003e\u003cbr\u003e\nNo — the Rock Pack is just the four ceramic blocks. Pick up a bottle of \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/polyplab-genesis-bacterial-blend-50ml-live-reef-bacteria\"\u003ePolypLab Genesis Bacterial Blend\u003c\/a\u003e separately, or grab the \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/polyplab-genesis-rock-booster-set-bacteria-ceramic-bio-media-reef\"\u003eGenesis Rock Booster Set\u003c\/a\u003e if you want a smaller bundle that includes bacteria.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat size tank is this Pack appropriate for?\u003c\/strong\u003e\u003cbr\u003e\nFour blocks is well-suited to medium-to-large reef systems. Larger tanks can use multiple packs distributed across sump and display zones; nano reefs may only need one or two blocks at a time.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhere exactly should I put the blocks?\u003c\/strong\u003e\u003cbr\u003e\nFor maximum nitrate reduction, place them in low-flow, low-oxygen spots — deep in rockwork, under the sand, or in a quiet sump chamber. For balanced aerobic + anaerobic filtration, put them in medium-flow areas. Spreading the four blocks across both zones gives you the best of both.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo the blocks ever need to be replaced?\u003c\/strong\u003e\u003cbr\u003e\nNo. The high-fired ceramic structure does not break down. As long as bacteria are dosed and the blocks are not damaged, they will keep providing surface area indefinitely.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs this safe for fish, corals, and inverts?\u003c\/strong\u003e\u003cbr\u003e\nYes. The ceramic is inert and reef-safe. No livestock impact when used as directed.\u003c\/p\u003e","brand":"PolypLab","offers":[{"title":"Default Title","offer_id":48758361227483,"sku":"R-00002","price":59.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/image_a4b991ae-c044-4b51-acd4-4e1f770a14ce.png?v=1778331176","url":"https:\/\/squeakysaquatics.com\/products\/polyplab-genesis-rock-pack-4-ceramic-bio-media-blocks-reef","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}