A consolodated mix of live ultra premium rock typically covered in polyps, zoos and other life imported for the mushrooms and polyps on it to sell as coral rock but if it's not in excellent condition or starts to die off in our system even if it's just a part of the rock, we throw it all into one large vatt of what we call cultured system rock.  It's fully cured and often has coraline algea covered over it.  The rock is small (typically .5" - 8" inches).  Such types of rock included may contain one or more of the following types of species (Fiji, Tonga, Marshal, Hawaiian, Buna, Solomon, Haiti, South Pacific, or other). Coloration will vary from deep purples encrusted with heavy coraline algae, plant growth and polyps to white like base rock. In either case, all the rock is heavily loaded with beneficial bacteria for the purpose it is intended for which is sump or refugium bio-rock. Use as a replacement for bio-ball systems or cherry pick from your shipment the best pieces to add to your reef. 

"All animals receive our "Arrive Alive Guarantee" with next day air shipping.  Thank you! Living Reef Imports LLC."