I agree with Mike and Dave. Your tank isn't cycled and stable yet. Take your water to a good fish store, and ask them to test it, show you how to test at home, and give you water chemistry 101. And get a test kit from them so you can do this regularly on your own. Once you get the tank cycled and your parameters stablized, THEN start adding in corals. SPS (like the hollywood stunner) are some of the hardest to keep. Within each category (softies, LPS [large polyp stonies], and SPS) there are some that are hardier than others. Some zoas (softies) are easy peasy, and others are persnickety as heck. Start with the easier/cheaper ones, watch for DBTCs, etc, until you get the hang of things. Then swap out to harder ones later.