Rob020880,
We appreciate your interest in the live rock we offer. Choosing a specific type of live rock for an aquarium is mainly a personal preference. The Fiji Premium live rock is a dense rock, while the Tonga Deepwater tends to be more porous. If you click on the picture in the item descriptions, you can view additional detailed photos of the live rock.
Sincerely,
Mike S.
LiveAquaria
Drs. Foster and Smith