I recently received an elegance coral from a friend b/c his Koran was feasting on it. It was about 6 inches when first purchased but is now completely sucked in and looks horrible. It was in his tank for about two weeks and has been in mine for two days now. It hasn't opened up much, but I also don't know anything about reviving a partially dead coral. Is there anything I can do to assist or is it probably too late?