CaribSea LifeRock Arch 18 Inch – Large Reef Arch Aquascaping Rock

Make a bold statement in your reef aquarium with CaribSea LifeRock Arch 18 Inch, a large-format aquascaping rock designed to create dramatic arches, swim-throughs, and open reef structures. Part of CaribSea’s premium LifeRock™ Shapes range, this arch delivers spectacular form, realistic coloration, and powerful biological performance.

Constructed from real aragonitic base rock—not cement—LifeRock Arch features extensive macro and micro porosity infused with living, spored bacteria to support efficient biological filtration and reduce cycling time. Its open, three-dimensional design provides excellent cover and play areas for fish, while offering natural ledges and shelves for corals and invertebrates. Despite its size, the arch maintains open water zones that promote optimal flow and circulation. Each piece is completely unique, environmentally responsible, pest-free, and ready to use straight out of the box with no curing required.

Key Features

• Real aragonitic reef rock with large arch formation
• Approximately 18″ size for dramatic aquascaping layouts
• Extensive macro and micro porosity for strong biological filtration
• Infused with living, spored bacteria to help shorten cycling time
• Open 3D structure creates swim-throughs and coral platforms
• Maintains excellent water flow and circulation
• Pest-free, reef-safe, and requires no curing

CaribSea LifeRock Arch 18 Inch is ideal for aquarists looking to build striking, high-impact reef aquascapes. Combining impressive scale, natural realism, and instant biological benefits, it’s a standout centerpiece for marine and reef aquariums.