I was browsing the co-op blog and saw this article about an alternative to moss walls. I'm interested in trying it out and have most of the plants I'd need, but I'm a little hesitant about spending $50+ on the mat, as I'd do this for a 36g tank. Has anyone tried this out, or done living walls in general? If you did, how did it turn out, especially in the long run? Was it worth it?