The video shows a red crab in an aquarium. The crab is seen walking around the bottom of the tank, which is covered in black gravel. There are also white rocks scattered throughout the gravel. The crab's movements are slow and deliberate as it navigates the tank. The aquarium appears to be well-maintained, with clear water and no visible algae or debris. The lighting in the tank is bright, highlighting the vibrant red color of the crab's shell and legs. There are no other creatures or objects in the tank, and the focus is solely on the crab.