The CaribSea Life Rock Arches consists of real aragonitic base rock, not cement. It requires no curing and can be added to the aquarium. These arches have extensive macro and micro-porosity infused with spored bacteria for outstanding biological performance. Clean and safe for all fish and inverts. Environmentally responsible and each piece is unique.

• Infused with beneficial bacteria
• No curing required
• Safe for reef or hard water aquaria
• 20 Lb Box Contains Four 12" Long Rocks
• Each piece is unique
20 lbs (4 x 12" Rocks)