Book excerpt: At the heart of this essential reference is a directory of more than 200 different fish, each presented in a beautiful close-up, full-color photo along with details about its origins, size, requirements, characteristics and care. Find out which fish work best for novice aquarium owners, which like plants, which live well in groups and which don't, plus what they eat, how they breed, and more. A wide range of fish are represented, including tetras, guppies, swordtails, mollies, angelfish, gouramis, Siamese fighting fish, and many other popular and more exotic species.