Reef Secrets. This is a beautiful book. There are lots of great pictures. The book is an excellent resource for those who are starting a reef tank. There are thorough and informative chapters on issues such as set-up, live rock, lighting, fitration, feeding, etc. The sections on selection & care of corals, other invertebrates, fishes, and algae are excellent. Issues of care, compatibility and conservation are addressed for all species.
Overall, this is an excellent beginner/intermediate book by a pair of recognized and respected authorities in the field. Their superb 4-volume series is an excellent value for the price.