The video shows a close-up of a rock formation in an aquarium. The rock is covered in various types of coral and algae, creating a vibrant and colorful display. The coral and algae are in shades of blue, green, and purple, and they appear to be thriving in the aquatic environment. The rock itself is a light brown color with darker spots and crevices. The water surrounding the rock is clear, allowing for a detailed view of the coral and algae. The video does not show any fish or other aquatic creatures, focusing solely on the rock formation and its inhabitants.