I have a bunch of older books from when I first got into the hobby(from like the early 90's) it's funny to see the difference between now and then. Like when Xenia were considered new and exciting additions to the list of available coral....or Remember when keeping an Anemone with clownfish, awas considered a must, but not a bubble tip, because back then they were called Red Gelam anemones, and bristle worms were scary scary things that could kill your corals. My point being books will become out dated, my favorite resource is boards, and research web pages from different universities.