All I have right now is Borneman's Aquarium Corals, which is a nice comprehensive book on corals. Julian Sprung and J. Charles Delbeek's The Reef Aquarium: Science, Art, and Technology, Vol. 3 is also supposed to be quite nice. Robert M. Fenner's The Conscientious Marine Aquarist is also supposed to be good, but getting a little dated. Overall, I would really say it is best to try and look in the book you are going to buy to see if it will work for you, there are a good number of dated, or less than stellar works out there, especially if you want it to be serious.