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I think most everyone will agree that Bob Fenner's book, The Concientious Marine Aquarist is one of the best available. When I started up, I bough The New Marine Aquarium, by Michael Paletta. It was good, but covers the very basics only.
I just finished reading Calfo and Fenner's Reef Invertabrates and was very pleasantly surprised to find the first few chapters on algaes, refugiums and several other topics... great book with WAY more than just inverts.