Alpha testers are currently running a test version of Marine Aquarium 3 with the totally rebuilt background which looks very good at 1920 x 1440. Also note the tank is now over 2 screenfuls wide and will span over multiple screens, so would look great at 3840 x 1440.
It is hoped that MA3 will be released this year. There are still interface and multi-monitor issues being resolved. Stay tuned!