Awesome! I have a cardinal tank also they are very neat shrimp! Take forever to breed but they are fun!
It does take up a lot of horizontal space. BUT, I also think the width coupled with such a "small looking" tank is precisely what draws attention to it.I do like the shape of those bookshelf tanks. Unfortunately, it always seemed like a really inefficient use of my wall space (being so shallow front-to-back) so I never got any.
I like your rock placement, and the algae growth is actually quite attractive. It almost looks like a freshwater version of a FOWLR reef tank with coralline growth.