I would suspect calling them "Nature" tanks might be a mistranslation, or just as close as they can get with the translation anyway. If you look at a Japanese garden, and look at Amano's tanks you can see the same philosphies at play IMHO.
Mine's a jungle at the moment, but it's more because I'm trying to see what's gong to survive
! I don't think I ever want to order an "assortment" of plants again. Especially of what turns out to be unlabeled plants