i have this for the 20, had to send the first one back since it wasn't quite flat, and two corners were higher than the others, making it wobbly a bit without the tank, even when i redid it several times on two different sets. water was slightly leaning on one side of the tank, so i had to use felt paper to even it out. they're really cheap, though, and look nice if you like metal. i think they'd work best if you had carpet, and if you really don't want a wood stand.