The video shows a vibrant red fish with a long tail and fins swimming in an aquarium. The fish has a sleek body and is the only one of its kind in the tank. The aquarium is filled with small, multicolored pebbles that cover the bottom. The fish moves gracefully through the water, occasionally darting quickly before slowing down again. The lighting in the tank highlights the fish's bright red color, making it stand out against the neutral background of the pebbles.