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There are several I keep handy.
The marine fish health and feeding handbook by bob goemans and lnce ichinosubo is good.
The two that top my list are the conscientious marine aquarist by bob fennner and Martin moe's marine aquarium handbook.
i would also suggest The coral reef aquarium by Tony Vargas, the Breeders guide by Matt wittenrick, and clownfishes by joyce Wilkerson.
The Reef Aquarium set is nice I have all 3 but if you were to buy only one volume buy volume 3. It covers almost everything in volumes 1 & 2 and more. I also like Borneman's book Aquarium Corals : Selection, Husbandry, and Natural History. Although not as comprhensive as The Reef Aquarium, it cover all of the essentials and is 1/3 the price.