The video shows a group of fish swimming in a tank. The fish are of different sizes and colors, and they are swimming around green plants that are growing in the tank. The water is clear, and the lighting is bright, making the colors of the fish and plants stand out. The fish are moving around in different directions, some swimming near the surface while others are deeper in the water. The plants sway gently with the movement of the water. The overall scene is peaceful and calming.