Well, my LFS does not have very much interesting live rock, what they have is very dense, non porous and not very pretty. I did notice however that underneath all of their tanks on a shelf they have dry man-made rock for about $3 per lb. This rock is very large and very open with many caves and such that would be great in my tank for the fish to hide and feel more safe. What I was wondering is if it would be okay to add some of this dry man made rock directly to my DT with about 100 lbs live rock already in it. Would this cause any problems? Is it even possible to place uncured rock in a DT with fish, corals, and live rock?