Space Invader Mycedium CoralHow to Care for Space Invader Mycedium Coral: (written by Dave Burr) The Space Invader Mycedium Coral will bring a good contrast to any reef aquarium as it encrusts over the rock. Tentacles: Space Invader Mycedium Corals have sweeper tentacles that come out at night so leave several inches between them and surrounding corals. Mycedium corals are close relatives of Chalice and Echinophyllia corals but should not be placed directly next to them as they