I think that it usually takes about two years to get all of the phosphate out of the rock (there is more than just on the surface), the crud out of the pores and for it to behave like real live rock bacterially with the anoxic zones that turn nitrate into nitrogen gas.
I will say that I do not think that concrete or man-made rock will never get here since it is not porous and covered in purple epoxy that blocks the pores if it even has any.
The stuff can cover with coralline and other things more quickly, but this is not where the magic is even though it looks nice.
I will say that I do not think that concrete or man-made rock will never get here since it is not porous and covered in purple epoxy that blocks the pores if it even has any.
The stuff can cover with coralline and other things more quickly, but this is not where the magic is even though it looks nice.