Along with there being so many different grades of rock, it's also worth noting that they come from many different areas and oceans as well. Some people like to have rock from a single location while others like to mix and match pieces from different locations to build intricate formations and increase the biodiversity within the tank. Rock from all the different collection points have different properties and amounts required. 
Detailed Description:
Brand New Introduction! This rock is fairly lightweight and porous so that you don't require as much rock as other types. It is generally recommended that you use 1 to 1.5 lb/gallon (US) Just look at the encrusted coralline on this rock. It is very lightweight and one of our most popular live rocks. It will also have some corals and incredible macroalgae. This live rock is a Caribbean live rock that is harvested from very shallow waters. 
Living Reef Imports LLC. is a world renowned importer and distributor of live rock and transships more varieties of live rock than any other distributor. This rock does not pass through several hands before it gets to our customers. We have it collected and imported directly into the United States where it is then distributed by us throughout the world. This rock is brand new but we only expect to bring in maybe a pallet worth once every couple months as it is hard to obtain. Our rock will smell and look like you collected it right out of the ocean yourself. No more concern of rotten, smelly high ammonia rock to worry about. Recommended Shipping:
We only recommend shipping via Air Cargo or 2nd Day Air or faster to deliver such fine quality rock in the best possible condition. Being base rock, UPS Ground is fine if better shipping conditions are not within your budget. By The Pound! Living Reef Imports Live Rock TIP: Don't forget that to grow a strong purple coralline algae (purple, green and red rock growth) you must have the necessary lighting consisting of 4watts per gallon of water as a rule of thumb and necessary trace elements of Iodine, Strontium, Molybdenum and liquid Calcium! These are the big trick all the true reef and saltwater hobbyists growing extremely beautiful live rock are doing and understand! The photos below are links to these items which are a must and should be added to every order of live rock not just as a starter kit but they must be kept up on a regular basis! | 
