The video shows a yellow seahorse swimming in an aquarium. The seahorse is moving slowly and gracefully among the coral and other sea creatures. The aquarium is well-lit, and the water is clear, allowing for a good view of the seahorse and its surroundings. The seahorse's body is curved in an S shape, and it has a small head with a pointed snout. The coral and other sea creatures in the background are various shades of brown and orange.