The video shows an aquarium with a fish and a crab. The fish is swimming around the tank while the crab is sitting on the bottom. The aquarium is decorated with plants and rocks, creating a natural habitat for the fish and crab. The fish is a vibrant blue color with a sleek body, while the crab is a darker shade of blue with a hard shell. The water in the tank is clear, allowing for a good view of the fish and crab. The fish is seen swimming around the tank, occasionally coming close to the crab, but the crab remains stationary throughout the video.