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i started the background with nylon mesh and light diffuser grid. this will work to reinforce it.
I marked the locations for all my fake plants and secured anchors to the grid that will stick up.
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the background substrate is greatstuff pond and stone with play sand mixed in. according to the reef nerds on some of the other marine forums, this stuff is fish safe and lasts a very long time without being sealed with epoxy or whatever.
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here's the semi finished product.
some guys put it directly to the glass. my theory is that the grid silicone to the glass will help reinforce the foam and keep it from floating away or breaking apart.