'loose rock' reef
I'm not into gluing rock unless I just want to make a bigger rock.
I build a reef that's easy to unbuild and rebuild---there are reasons that come along.

How I do it.
I lay down a layer of eggcrate lighting grid to prevent point load on the bottom glass, I place several ugly and large rocks to use as pillars to support the rest, I add my sand---which leaves the tops of the pillar rocks exposed. I then set a bowl in the sand and start adding water---the...