Fire mouths are a good choice. Maybe one JD and a pleco. Give them ALOT of hiding places and places for breeding. Convicts breed like crazy!!
Flower pots are a good choice. The ceramic ones. Break it up and lay it down so it creates a hiding place. The pleco will be a nice addition to be a bottom feeder. If you go with a pleco get at least one piece of driftwood.
Some slate works well to create tunnels and caves.
What type of filtration are you running?
"When creating an aqua scape, strive for the beauty of imperfection, as its art and there is no wrong or right, it's left open for interpretation" James Findley