Ultra Aquarium

Ultra Aquarium is a living 3D reef for Windows 10/11 (64-bit). Use it as a screensaver or as live wallpaper. On a multi-monitor desk it becomes one long tank: fish swim from screen to screen, and you can set your bezel width so the picture lines up across the gaps, even with mixed sizes and refresh rates. Press F to feed the fish. Lighting follows your PC clock from morning to a dark glowing reef at night. The newest resident is Octopus Boy, who lives in a cave, changes colour to blend in, and comes out more at night. A quality slider goes from 1 (laptop graphics) to 10 (a proper GPU).

Honest details: it's free with no ads and nothing to buy, but it isn't open source (the code on GitHub is viewable for inspection only). It was built with a lot of AI help (Claude, ChatGPT, Grok). It collects anonymous usage data by default; turn that off with "Share anonymous usage" on the About page. Download: https://aquarium.technology83.com/download · GitHub: https://github.com/leksicon1/aquarium