In the video, there are two fish swimming in a tank. One of the fish is larger than the other. The larger fish is swimming around the tank and then suddenly jumps out of the water, causing a splash. The smaller fish is swimming around the tank, seemingly unaffected by the larger fish's actions. The tank appears to be made of glass and has a green and yellow pattern on the bottom. The water in the tank is clear, and the fish are both a dark color.