What is some neat plants that will grow on rocks?
In my store I am setting up a tank for Discus, 120 gal. I built a rock wall in it. Kinda how the inside of a garden pond has a rock wall. Only thing is most of the rocks are pretty smooth. I'm having a difficult time trying to figure out what plants I want in it. I already have a 200 gal. fully planted tank in the front of the store. (Which is beautiful and I am very proud of.) But I want something different. I do not want Java anything in it, or Anubis. I am saving those for another tank.
I guess basically what I am asking is.... is there any neat looking/exotic plants that do not necessarily need to be planted in substrate? A plant that would be content placed in crevasses of the rocks? I have a whistiria that has gone crazy and needs a trimming. I also have tons of Ludwigia. I'm just looking for ideas. Anything will help :]