The video shows a group of fish swimming in a tank. The fish are of different colors, including red, orange, and black. They are swimming around and interacting with each other. The water in the tank is clear and blue. There is a bubbler in the tank, which is creating bubbles and moving the fish around. The fish are of different sizes and shapes, with some having long fins and others being more rounded. The tank appears to be well-maintained and clean.