Nice collection mate, as dave said i would definitely put a dark background if possible. Take it from me you don't have to have plants for beautiful tanks, with a bit of imagination and a bit more rocks and wood you could create something really nice. Plants dont really figure in central biotopes, especially some of the fish you've got. They would be either eaten or dug up. Plants are ok for some of the smaller centrals such as cryptoheros, archocentrus, etc.