I think youíre being a bit hard on yourself; this is a actually a pretty nice looking setup. Iím betting that your Cory is spending plenty of time in that cave, yes? It might like a friend or two, or three, but you donít want to overload the tank, obviously. Itís just theyíre just social fish. I actually have a single Cory that is very chummy with my single striped loach. Any port in a storm, I guess. On the plant front, have you considered Anubias? Theyíre low maintenance and look bigger than they are in smaller tanks.