In one of the first, if not the first, edition of Coral magazine, Daniel Knop has an article ( and a great MACNA presentation) on really, really, tiny Nano tanks like this. See if you can find it somewhere.
I Am Going To Be Setting A 2g Pico Up As Well Seen Alot Of Threads On Rc On How They Do Them. Ill See If I Can Find The Link. What Do You Plan To Keep In It ?