4in x 4in Biological Coral Grow-Out Frag Tiles IceCap's 4" Coral Frag Tiles feature a dense arrangement of small ceramic spheres that create an ideal mounting surface for coral propagation and growth. The larger tile format provides excellent stability and ample space for coral development. These versatile tiles are ideal for fast-growing species like Montipora, Zoanthids, and Chalices, while also providing an excellent biological foundation for small SPS colony grow-out. They're equally effective as stable mounting bases for Euphyllia corals, including torches, hammers, and frogspawn. Installation is simple and secure using cyanoacrylate super glue gel (sold separately) for professional-quality coral mounting and propagation. Dimensions (LxWxH): 4in x 4in x .25inQuantity Per Box: 10pcs Features: Ultra-High Surface AreaNatural Tan ColorTextured Mounting SurfaceNeutral pH(7-7.5)Great for Frag FarmingWhy Biological Frag Plugs Are Superior to Traditional Plugs: Enhanced Coral Bonding - Porous ceramic sphere construction provides superior surface area that encrusting corals can naturally bond to, creating stronger, more stable attachmentsImproved Water Flow - Porous design allows water to flow freely through the plug, unlike solid traditional plugs that restrict circulationHealthy Bacterial Colonization - Increased surface area promotes beneficial bacteria growth without affecting pH levelsNatural Aesthetics - Natural coloration blends seamlessly into reef displays, eliminating the unsightly bright white contrast of traditional plugsReduced Algae Growth - Natural color reduces algae promotion compared to bright white traditional plugs that can become an eyesoreTrue Porosity - Unlike traditional plugs that may have surface texturing but remain solid and non-porous, biological plugs offer genuine porosity throughout