The video shows a close-up of a clownfish swimming in and out of the tentacles of a sea anemone. The clownfish is orange with white stripes, and the sea anemone is pink with long tentacles. The clownfish moves gracefully, and the sea anemone's tentacles sway gently in the water. The video captures the symbiotic relationship between the two marine animals, with the clownfish seeking protection from predators and the sea anemone receiving nutrients from the clownfish.