This book is ideal for the hobbiest who wants to make the transition from blindly maintaining a reef tank that lives, to a vibrate natural system, incorporating natural filters and food production. Goes into detail of various refugiums methods (nutrient export, plankton production, etc), and info on deep and live sand beds. Section on macroalgae is very good, with good clear photos for identification and basic description and care info. Also contains info and photos on other welcome and unwelcome reef members, such as shrimps, crabs, snails, nudibranchs, mantis shrimps, worms (featherdusters), sponges, clams, starfish, sea squirts, etc. Note that it talks about these invertebrates as a family, and usually does not go into detail of subspecies, in general this book cant be used to identify a particular subspecies, just general care/info. This book describes all the invertebrates that most coral books leave out. This book provides introductory information for a wide range of topics, good for those who have not been aware of these techniques or are considering adding to their system, this is a good springboard to the wider marine world although detail is lacking in implementation and further research would definitely be required. At times topics are spread widely, but a little too thinly. There are many examples where the authors will tell you about something that you need to know, but wont tell you the answer, eg: In reference to macroalgae going sexual, it says "sexual events are fairly predictable, and are easily avoided...", yet it does not describe how to predict (ie, what signs to look for), or how to avoid. However scientific names/terms are used, which can be used to search the internet. If, like me, you like constantly adding fresh pieces of live rock to your system to see what wonderful things come/grow on it, I would recommend this book, especially if you have recently moved from marine to reek keeping.