There are so many choices w/ doing a SA tank.
-Angles, discus, dwarf cichlids, smaller tetra schools, plecos, and live SA plants.
-Geos, servs, larger tetras, plecos, pitcus cats, and some live plants. I would only use very hardy plants like amazon swords.
-Breeding pairs of large aggressive SA like red terrors, and some large dithers like silver dollars.
Just a few ideas.