close up shot on the giant octopus with rock and plant in the background in clear water tank

close shot giant octopus rock plant background clear water tank arm glass natural nature suckers brown animal monster move common ocean tentacles life environment octopoda pacific raw single tropical wild seafood shellfish sea squid reef arms blue aquatic vulgaris scuba aquarium mollusk cephalopod tako creature food wildlife cephalopods underwater swim tentacle dofleini green ringed marine isolated