Okay... so here's how it's done to have it half in/half out of the wall. Figure out how thick your wall is (average indoor walls are 4-6 inches thick). Then what you do is divide the depth of your tank in half. Of those two halves, subtract half the thickness of the wall. Build the stand so that the tank sits in and out of the wall. The canopy can actually be built 100% behind the wall, just make a false canopy front so that it gives the look of the in/out wall tank..
Did that make sense?
