The image shows a close-up of a coral reef in an aquarium. The coral reef is made up of small rocks and pebbles, and there are a few coral reefs visible in the background. In the center of the image, there is a long, cylindrical object that appears to be a fish or a sea slug. The object is brown in color and has a rough texture. It is lying on the ground, with its body facing towards the right side of the frame. The background is dark, making the coral reef stand out even more.