I am from India and i accidently found this site while searching on google for information on japanese architecture esp aquariums. If anyone can provide me any site which i can refer to, please mail me at patil.gauri@gmail.com
One of the members has a Japanese architect for a boyfriend. She's out of town this week, but when she returns, I'll try to get some info from him.
You might also try looking under fish farms. I visited a large one in Kyushu that was amazing. It may take a while, but I'm sure more people will help you with ideas. Glad you found Jref, post often and enjoy!