The aluminum angle is siliconed to the walls in my tank. The foam stays in place on its own. As it turns out, placing plastic mesh between the foam and aluminum also makes putting a moss wall over it very easy. The aluminum however is a bit unsightly. There are a couple ways I could fix this.
1) I could attach some plastic mesh to cover it and grow it out.
2) I could use just the angle on the back, put a plate of glass on that, and wedge the foam in between (I'll make a picture).
3) Like the above photo or option 2, but without the aluminum angle. This would require gluing the new pane to the bottom for extra support (a good idea with option 2 as well). Placing a small plate near the top (planar with the bottom of the tank, orthogonal to the new pane and back wall) would support the top.
Edit: schematic of Option 2 attached. Gray is aluminum, light blue is glass, darker blue is foam.
Last edited by jccaclimber; 11-29-2011 at 12:50 AM.