The video shows a large lizard with a long tail and sharp teeth in a glass tank filled with water. The lizard is seen swimming and moving around the tank, with several orange fish swimming around it. The lizard appears to be hunting the fish, as it opens its mouth wide and attempts to catch them. The fish are seen swimming away from the lizard, trying to avoid being caught. The tank is surrounded by a green grass-like material, and the water is clear, allowing for a full view of the lizard and the fish.