ADA is mythical trademark in aquarium. Its founder Takashi Amano, the guru of nature aquarium philosophy, has its own personal website where you can admire his beautiful nature pictures.
Much more interesting (and inspiring) are pictures published in the galleries of both the European site ADA Europe
and in Japanese main site
where You can, also, find links to other ADA sites scattered throughout the various countries; lot of material including downloadable manuals about creation and maintenace of Nature Aquarium.