The madagascar definitely steals the show, but it is so healthy and beautiful I don't think I'd be able to remove it. Perhaps something to soften the base of it? A couple moss covered rocks (flatter rather than tall), or a short growing plant. With nothing in front of it, it looks closer to the front than it really is and makes the tank seem smaller. I like how you've arranged the left side, the rock is perfect with the moss to soften it and the plants are a nice mix.