The video shows a group of small fish swimming around in an aquarium. The fish are mostly dark in color, with some having stripes or spots. They are seen swimming in and out of the crevices of the rocks that make up the aquarium's decor. The rocks are of various sizes and shapes, with some having holes and crevices that the fish use as hiding spots. The water is clear, and the lighting in the aquarium highlights the fish and the rocks, creating a serene underwater scene.