Size for a Pixie enclosure?

[Bruce]

You can raise a pixie in a 20 gallon. All they want to do is eat, poop, soak, and stay still, until it's time to start over.

From that I hear this is correct, however this is a bare minimum size, and who also have to factor in the size of your enclosures decorations, water dish, ect. Is the tank going to be a 50/50? If so I would suggest a 40 long, especially if your frog is a male.