In the video, a small fish is seen swimming around in a fish tank. The tank is filled with red gravel, and there is a small cave-like structure in the background. The fish appears to be exploring its surroundings, moving around the tank and occasionally swimming near the cave. The water in the tank is clear, and the lighting is bright, highlighting the vibrant red color of the gravel. The fish is the only living creature visible in the tank, and it seems to be healthy and active.