I think with these fish I would put in a lot of moss and one or two anubias gigantea might work nicely. I was wondering what kind of light you have on there. All in all though this is a great looking tank with some gorgeous fish. What is that one in the left side rear of pic 2, obviously it's a discus, but what kind? If that isn't a shadow messing with the colors that's the coolest discus I've ever seen.