Live rock - Wikipedia, the free encyclopedia
"Live rock" is rock from the ocean that has been introduced into a saltwater aquarium, which confers to the closed marine system multiple benefits desired by the salt water marine hobbyist. The name sometimes leads to misunderstandings as "live rock" is itself not actually alive,
but is made simply from the calcium carbonate skeletons of long dead corals, or other calcareous organisms, which in the ocean form the majority of coral reefs. When taken from the ocean it is usually encrusted with Coralline algae and inhabited by a multitude of marine organisms. The many forms of micro and macroscopic marine life that live on and inside of the rock, and which acts as an ideal habitat, give it name "live rock."
I stand by my opinion that this rock might be fine. Like I said earlier, I don't know how porus it might be however, and most Fiji rock isn't the most porus either, yet it's very popular.
Porosity in live rock can be from a number of sources; the natural porosity of the coral that it once was, burrowing and tunneling from various marine organisms such as worms, as well as other natural causes.
ALL live rock is dead coral skeletons. That's where the calcium carbonate comes from...it's NOT "rock."