All I did was take some flat rocks, slate chunks, and river rocks. I built caves in the sense that I made sure there were line of sight blocks, and places to sneak in and out of. Also have java ferns and fire moss through the tank.
However, the saga continues. I now have a electric blue cichlid, 2 jewels, and a convict. The rehoming of the other fish went south so I took them all.
For now the tank is peaceful, however I need to watch as they grow. Most likely scale down to one Jewel once I see who has the best temper. Have a buddy that will take one, but it has to grow out first as his tank is well established with some large fish. 4+ inches for most. My little jewels are only 1.5"-2".