In the video, a small fish is seen swimming in a tank filled with black gravel. The fish is moving around a cave-like structure that is decorated with a starfish and other sea creatures. The water in the tank is clear, and the lighting is bright, highlighting the details of the fish and the decorations. The fish appears to be exploring its surroundings, swimming in and out of the cave. The overall atmosphere of the video is calm and serene, with the gentle movement of the fish creating a soothing effect.