None, I'm afraid. They need a tank with a 60 x 30 cm footprint.
There are very few fish that can be kept in this tank as the dimensions are 35 x 33 x 33 cm (14 x 13 x 13 inches). The only fish I can think of that would be suitable is a single betta, male or female. Even the tiny nano fish such as chili rasboras need a tank at least 45 cm long.