I had to click on "Other (wide)." I'm running the Aquarium on a Sony 24" widescreen computer monitor (GDM-W900) which actually has a 16 x 10 picture tube. I can set it to 1920 x 1080, which is 16 x 9, but a full size picture is actually 1920 x 1200. Let me tell you...the Aquarium looks awesome on a widescreen display!