As for the porosity, the ceramic rock pieces I purchased are lighter than some of my natural live rock and the pieces are bigger so I assume this means that it is more porous and less dense than real LV. Obviously it still should probably be used in conjunction with natural live rock because...
I recently came across a ceramic rock alternative to live rock.. It is designed to function as live rock. Its called vidarock and made by a USA co called cerameco. Ive got some nice pieces and have them in my tank. The porosity is great and I really think they have alot of advantages over LV.
