The image shows a close-up of a small amount of small rocks and pebbles in a tank. The rocks are white and blue in color, and they are scattered across the surface of the tank. There is a brownish-brown substance on the right side of the image, which appears to be a mixture of sand or water. The background is blurred, but it seems like the tank is sitting on a wooden surface. The image is taken from a top-down perspective, looking down on the rocks.