im not sure why you would want a poop machine goldfish in a tank(luck maybe?) other possible tank stockings would be some african dwarf frogs or like durbkat said, a betta. i, would get two dwarf puffers, but i wouldnt suggest you getting this if you just started fish keeping. i know people will disagree with me with keeping 2 puffers in a 5 gallon, but from experience, i know it can work, as long as there are enough cover.

i dont know of anybody that has a 64 or a 128 stick. everybody i know either has 32, 256, 512, or a gig(pretty much everything but 64, 128, and 2 gigs)(pretty much everything but 64, 128, and 2 gigs)