The video shows a small seahorse with a curled tail, swimming in an aquarium. The seahorse is predominantly white with some pink spots on its body. It is surrounded by green plants and a red coral reef. The water in the aquarium is clear, and small bubbles can be seen rising to the surface. The seahorse moves slowly and gracefully, using its tail to hold onto the plants. The lighting in the aquarium casts a blue hue on the scene, creating a calming and serene atmosphere.