The Conscientious Marine Aquarist - Dr. Robert Fenner
The Complete Book of the Marine Aquarium - Robert Hargreaves
The New Marine Aquarium: Step-By-Step Setup and Stocking Guide - Michael Paletta
...can't really recommend "For Dummies," even the updated 2007 version. While the 2007 version is slightly better than the older one, some parts are still very vague, and poorly organized. Besides, no color pictures. Yuck!