marine chemistry by CR Brightwell < quite in-depth book on chemistry in a reef aquarium will definitely help out a lot to keep the system running well and balanced.
A practical guide to corals by Ed Puterbaugh < this is a quick reference to corals great to take to stores and look into before you buy corals.
The marine reef aquarium by Philip Hunt < the basic info on keeping and starting a reef tank
aquarium corals selection, Husbandry, and natural history by Eric H Borneman < this book goes in depth on all corals on husbandry selection and propagation.
The conscientious marine aquarist by Robert M Fenner < This book explains the ins and out's of reefing.
Marine reef aquarium handbook by Dr Robert J Goldstien < This book is great for quick trouble shooting
Algae a problem solver by Julian Sprung < this book will save you a lot of trouble.
I have sat down and went over all these book repeatedly and gain more knowledge every time read them. Hope this helps and happy reefing