Two inches of this sand has gone in:
(Photo taken before the last of the sand was added)
15lbs was new, and 5 (or so) pounds is from my 12 gallon Nano Cube, which was "retired" in June.
My rock structure has been glued together, and is curing on the bathroom floor downstairs. I *think* it will hold together long enough to get it up the stairs and into the tank.
As my rock is not live rock, I think I'm going to break a rule and add it before the water. The water will come from my main display system, over the course of a couple of water changes. I think.