I have a couple of 3 quart picos and did have a 1 quart pico made from a brandy snifter that we kept for a bit over a year. I have seen picos in the 3" x 3" x 3' size range as well.......BTW, IIRC 2.5 gal and smaller are classed as pico tanks, Nano are larger than 2.5 gal, so your friend has a pico sized tank, not a nano.