dsoz Posted December 4, 2009 Share Posted December 4, 2009 I have about 300 or 400 lbs of man-made concrete rock that I made that I would like to sell at $2/lb. The rock was made with either grey portland cement or white portland cement, crushed coral, and rock salt. The rock is extremely porous and most pieces are low density. About 100 lbs are in a tank of saltwater with fish. The rock is cured and cultured. Most is covered with coraline and there is a large population of feather duster tubeworms and stomatella snails in the tank growing on the rock. dsoz Quote Link to comment Share on other sites More sharing options...
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