The video shows a close-up of a sea anemone with long tentacles. The anemone is situated in a colorful coral reef, surrounded by various types of coral and marine life. The tentacles of the anemone are moving gently in the water, suggesting the presence of a current. The colors of the coral reef are vibrant, with shades of purple, pink, and green. The anemone itself has a brownish color with white tips on its tentacles. The video does not show any other marine animals or human activity.