The IceCap 2in Biological Coral Frag Tile (15pcs) is a flat, square porous ceramic tile built for coral colonies that have outgrown a standard round frag plug. The larger 2in x 2in footprint gives corals more stable footing and room to spread as they establish. Dimensions: 2in x 2in x 0.25in Quantity: 15 pieces per box Best for: Montipora, Zoanthids, Chalices, small SPS colony grow-out, and Euphyllia (torch, hammer, frogspawn) Color: natural tan — blends into reef displays instead of standing out like bright white plugs pH: neutral (7-7.5), safe for reef and mixed systems Unlike round plugs, tiles sit flat rather than fitting into a rack hole — a better choice for multi-head colonies or frags you want to grow out before final placement rather than rotate through a rack.Use with: cyanoacrylate super glue gel (sold separately) for mounting.