Xyenia, Large polyps with thin stems connected at the base. Polyps do not fully retract. Very tiny alcareous needles or completely lack skeleton. Polyps can be up to 15 mm long under intense
lighting. Tentacles are pinnated. Some will move polyps in rhythmic motion to help exchange gases. Color is beige, cream or light brown.will develop UV protection matter under halides and color will be red, green, blue or irridescent. Can be accli
mated to halides well. Can do well under fluorescent lights if high levels are used. Can overgrow stony corals. Propagate by cuttings.