macro photography of long-spined black sea urchin diadema setosum in a fish tank.

animal aquarium aquatic background biology black closeup coral crawling cute dangerous dark deep diadema diadematidae dive echinoderm echinoidea edible exotic fish fishtank life long longspined macro marine natural nature needles ocean pattern photography reef round saltwater sea setosum spiky spined spinous swimming tank texture thorny tropical underwater urchin water wild wildlife