If you have soft, acidic water II think a really cool SA tank would be rams, twig catfish (farlowella), marbled hatchetfish, and a big school of some kind of pencilfish. Someone at each tank height, similar conditions, and the rams essentially have the tank bottom to themselves. (the twigs go down to eat but don't hang out there.)
Then a bunch of live plants including floaters, some driftwood, and some oak or Indian almond leaves.
Then a bunch of live plants including floaters, some driftwood, and some oak or Indian almond leaves.