The video shows a seahorse swimming in a tank of water. The seahorse is brown and has a long tail. It is swimming near the top of the tank, and there are bubbles visible in the water. The seahorse moves slowly and gracefully, and its body is curved in an S shape. The tank appears to be made of glass, and there is no other visible life in the tank. The water is clear, and the lighting is bright, making the seahorse's brown color stand out.