Used butt like new conditio.: Cichlids: Understanding Angelfish, Oscars, Discus, and Others by David Alderton. 144 pages, copyright 2003. One of the most popular choices for home aquariums, CICHLIDS come in a variety of colors, shapes, and sizes. From the Fish Keeping Made Easy series, this book covers diet and nutrition, recognizing and treating illness, biology, breeding and more.