The video shows a yellow fish with black stripes swimming in a tank with a sandy bottom. The fish approaches a crab and opens its mouth, seemingly trying to eat the crab. The crab, however, appears to be defending itself by raising its claws. The fish continues to approach the crab, and the crab raises its claws again. The fish then moves away from the crab, and the crab lowers its claws. The video ends with the fish swimming away from the crab.