I have seen pictures of beautiful tanks with structures made out of rocks and i love the idea and wish to buy some i just dont know where i would get any of the stones =/
rock quarry or even home depot or lowes. Etc houseware stores have it. I rinse all my rocks and soak them in water for three or so days before i put them in my tank. May be overkill but it certainly has never hurt.
i work for a roofing company, so i get it there. the pieces on the ends of pallets are extra thick for support of the skid, but too thick to install on roofs.