Large colourful flatworm with small soft spikes on its back crawls carefully through a coral reef in search of food

flatworm nudibranch sea slug acanthozoon marine life reef coral biodiversity scuba scuba diving underwater exotic diver south east asia species sea wildlife dive slithering slime pattern ocean small creature tiny worm closeup nature marine animal slug beautiful extreme close up bizarre crawling tropical odd interesting flat natural travelling background textured moving water carpet colorful sliding elegant