Ultra Aquariumby Technology 83

One aquarium across all your screens.

Ultra Aquarium is a free 3D aquarium for Windows. It runs as your screensaver or as live wallpaper, and it treats two, three or four monitors as a single tank, so a shark can cross from one screen to the next.

Download for WindowsFree. Version 7.0.3, 13 MB. Windows 10 or 11, 64-bit.
A coral reef full of fish, shown running across three monitors

Pick your screens

Choose which monitors show the aquarium. The others keep your desktop, or go black while the screensaver runs.

Mixed setups are fine

Different sizes, resolutions and refresh rates work together. Enter your bezel width and the picture lines up across the gap.

Feed the fish

Press F and a pinch of food drops in from the surface. The nearest fish come over to eat.

Runs on a laptop

The lowest quality setting is built for integrated graphics. Turn it up when you have the hardware.

Installing

Run the installer and Ultra Aquarium opens when it finishes. If Windows asks for the .NET 8 Desktop Runtime, say yes: it is a free Microsoft component that many apps share. When a new version is out, the app asks before updating.