4th tank down. :) There is a lovely buddha tucked away in the right. I have the same one in my planted zen-esque tank (though it's probably too heavily planted to be a proper Zen tank) and I love it. :)
Also, I know we aren't supposed to recommend other forums, so please don't take this as a recommendation, but if you visit fishlore and look the member Lea, she has photos of the multiple stages of that Zen tank in her albums. :) It has changed a lot over the years, but has always been beautiful.