I stacked the rock in my Red Sea Max against the back glass and aganst a small portion of one of the sides that you can't see from outside. I don't like the look of an island of rock in the middle of a nano tanks and prefer a reef wall look. I'll just let the back get covered in coraline algae. I left enough space for a magcleaner on the front and sides.
The only downside I have seen with this is it is more difficult, but still possible, to suck up debris that gets trapped behind the rock. I am able to poke a 1/2 inch hose through holes in the rock and clean behind it.
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