@vietnamtodayvtv: The reef provides fish with a safe sanctuary. In return, as they move through its coral passages, fish help circulate water and oxygen, allowing the reef to breathe and thrive. In this delicate chain, every species is a guardian for another. This ancient "agreement" has kept the entire ecosystem alive. #VietnamToday #VietnamWildLive #CoralReefs #Fish #Mangroove#Ecology #Protection #ConDao #BioDiversity