4K.Small fish between the spines of a sea urchin.Long-Spined sea urchin in its natural underwater habitat: Diadema setosum.Diadema setosum is a species of long-spined sea urchin belonging to the family Diadematidae.Orange ring, five white spots, blue iridophores.Underwater of a real sea with microscopic animals, planktons and small fishes in natural ecosystem.Include bacteria, archaea, algae, protozoa and drifting or floating animal.Mossy moss sea-urchin echinus urchin coral reef clear turquoise light blue ocean untouched coast unspoiled nobody wide angle cinematic background landscape deep dark nature rock rocky stony stone idyllic true color simple standard ambience bare seaweed alga rocks organisms marine aquatic aqua surrounded by surrounding ambiance scene scenic beautiful gorgeous spectacular best. UHD 4K 3840X2160.