The video depicts a group of fish swimming around a rock structure in an aquarium. The fish are of various sizes and colors, including orange and silver. The rock structure has a rough texture and is covered in algae, indicating it has been in the water for some time. The aquarium appears to be well-maintained, with clear water and a sandy bottom. The fish are seen swimming in different directions, some hiding behind the rock structure while others swim in the open water. The lighting in the aquarium is bright, highlighting the colors of the fish and the details of the rock structure.