Heh, if that is a 5 foot tank, that driftwood is a monster.
I have the Schultz APS in my 72 and while the plants seem to like it, it is a bit too light for my liking (sometimes plants aren't held down that well). The silica might help in this regard.
I'm not sure what that plant is in the left foreground, but perhaps it might get too big for the front very soon?
Keep posting pics; looking forward to seeing the fish.
Oh and I don't really know how much filtration discus need but you may want to add a powerhead to ensure circulation since it is such a big tank. I like the Koralias myself.