actinia sp., sea anemone in black sea saltwater marine biotope aquarium, macro shot of invasive alien species on stone

actinia active adult algae alien anemone animal aqua aquaculture aquarium aquascape aquatic atlantic background biodiversity biotope black body clear closeup colorful concept design environment estuary exotic fauna fish fishkeeping free friendly funny group instinct invasion invasive life lineatus littoral live macro marine mollusc mytilaster native nature ocean red reef salinity saltwater sea shot space species stone substrate tank tentacle underwater water widespread wild zone