orange striped green sea anemone, possibly diadumene lineata, unusual marine creature, invasive deathly predator, venomous

actinia active adult anemone animal aqua aquarium aquascape atlantic background biodiversity biotope black body captive chemical clear closeup colorful concept conditions controlled creature deathly design diadumene disaster ecology environment estuary exotic fauna free green instinct invasion invasive invertebrate leans life light lineata marine native nature ocean orange poisonous possibly predator reef salinity saltwater sea space striped substrate tank tentacle tentacles threat toxic underwater unusual venomous water weapon widespread wild