The video shows a group of fish swimming around in an aquarium. The fish are of different sizes and colors, with some being darker and others being lighter. They are swimming around in the water, which is clear and has a blue tint. The aquarium is decorated with rocks and pebbles, and there is a plant in the corner. The fish are moving in different directions, some swimming towards the camera and others away from it. The lighting in the aquarium is bright, making the colors of the fish stand out.