Sweet tank, Ben! That's going to be a killer when it grows out. You might want something tall on the right - but not anything that will take the focal point away from your main tree thing (which I like a lot). Actually, the Java moss grown large and full on the right would do the trick beautifully.
In a week or so I'll send you some Java fern - Microsorum Pteropus 'Wendilov.' I think it will look good tied to the tree. Anyway, if you don't like the looks of it, you can use it elsewhere... or in another tank... or, I hear it tastes pretty good with a little salad dressing.
