The video shows a yellow and green striped fish with a white underbelly and a small mouth. The fish is swimming in a tank with a sandy bottom and a few small rocks. There is a crab with a brownish shell and long legs on the sand. The fish approaches the crab and appears to be sniffing or nudging it. The background is dark, indicating that the tank is likely underwater. There are no visible titles, subtitles, or informative text in the video.