They are easy to use reference books that list a variety of corals and their care requirements. If you are trying to decide what corals you want in your aquarium, thumbing through these books is a great way to find what you want. Although scientific names are given, the arrangement of the book is based more on common names. It includes all of the guidelines that the above book has, as well as aquarium placement and feeding. It covers more species and has more pictures.
More detail is given and it even includes a nice taxonomic chart in the beginning.
The following paragraphs cover volumes one and two. Also see the full review of volume three . Doug Robbins has also done a review of volume three for Aquarium Frontiers. The information presented can be difficult to follow at times and very technical. If you are a beginner look elsewhere, but if you are intermediate to advanced and want to know more these are great.