Im enjoying my saltwater aquariums for dummies book it has lots of useful info. I saw a book at petsmart that looked good also,but I dont know the name. It had real nice pictures of fish,coral,algae, etc.It was only about 20$.
My 2 favorites are "The Conscientious Marine Aquarist" by Robert M.Fenner and "The Complete Book Of The Marine Aquarium" by Vinvent B. Hargraves. Both books have a lot of useful and helpful information. When it comes to books, go to your local library. Most people seem to forget about the library when they get older. Once we get out of school, we seem to think that we no longer need the library.