The video shows a large aquarium filled with water and a variety of fish. The fish are of different sizes and colors, including yellow, orange, and black. The aquarium is well-lit, and the water is clear, allowing for a good view of the fish. The fish are swimming around the tank, some near the surface and others near the bottom. There are no visible plants or decorations in the tank, but there is a filter and a heater. The fish seem to be healthy and active.