Of all the many different types of aquaria, probably the most interesting and beautiful is the modern reef aquarium. It is compellingly attractive because of its colorful inhabitants and their fascinating ways. Anyone passing a modern reef aquarium has to look at it. Oddly enough, the modern reef aquarium is not difficult to set up and keep running if you know what you are doing. Dr. Emmens' scientific authority and long experience with marine aquaria and their equipment will help you with this fascinating hobby.