The video shows a fish tank with a blue fish swimming around. The tank is decorated with rocks and coral, and there is a light shining from the bottom. The fish is seen swimming around the tank, exploring the different decorations. The colors in the tank are vibrant, with the blue of the fish contrasting against the various shades of the rocks and coral. The fish moves smoothly through the water, occasionally darting between the decorations. The light from the bottom of the tank casts a glow on the fish and the decorations, highlighting their textures and colors.