striped sea anemone, possibly diadumene lineata, unique and weird marine creature, deathly predator with venomous tentacles

actinia active adult alien anemone animal aqua aquaculture aquarium aquascape aquatic atlantic background biodiversity biotope black body chemical clear closeup colorful concept creature deathly design diadumene environment estuary exotic fauna free hunt instinct invasion invasive invertebrate life lineata macro marine mollusc native nature ocean poisonous possibly predator reef salinity saltwater sea shell shot space species stone striped substrate tank tentacle tentacles underwater unique venomous water weapon weird widespread wild