Real aragonitic base rock, not cement, no curing. Extensive macro and micro-porosity infused with spored bacteria for outstanding biological performance. Clean and safe for all fish and inverts, environmentally responsible each piece being very unique. Please Note: Because of the fragile nature of this rock, it is possible for the rock to break during transport. We do our best to package the rock sufficiently to minimize damages. Rock is not insurable and we are unable to replace or refund damaged pieces. If desired, multiple pieces of rock can be reattached using aquarium glue or epoxy.