Real Reef, Large, 50 lb. BoxReal Reef Rock is our standard reef-building rock. It comes in a variety of sizes from small to show-size custom. It is very light, porous and full of holes and crevices. It is three-dimensional in shape and comes in many natural shades of purple, pink and red. It replicates the look, feel and function of coralline-encrusted coral skeleton rock. Its made from all-natural, reef eco-friendly materials and grown in greenhouses to become a bio-active rock, without the nuisance pests and hitchhikers commonly found on wild rock. This rock is great for Marine Reef and fish-only aquariums. Not suggested for Freshwater, as it holds a high, stable pH.Shipping Notes: This rock is fragile and can incur damage during shipping. We are not able to insure rocks; therefore, we can not replace or refund broken pieces. Most broken pieces can be repaired with epoxy or coral glue.