Yup, Aqua forest in Shinjuku, it was hidden underground. Makes me realize how much of Japan I've never seen as this is my 7th time here and the first time I've seen any aquarium stores. I had my translator look them up and draw maps for me. I also went to a nice aquarium store on the roof of a building in Ginza. Aqua forest was by far the best one.
I got some beautiful willow moss but I'm sure if I can bring it back to states with me.... Do I just declare it at customs? Anyone know anything about that?