This soft cover book identifies algae that becomes problematic in aquariums. It has over 180 full color photos, some that where taken under the microscope to show important identifying features of algae. It includes chapters that explains the physical, chemical, and biological requirements of algae, has extensive recommendations for ways to control algae growth, how to eliminate red slime algae once and for all, how to stop green hair algae from ruining your aquarium, how to stop a dinoflagellate bloom, how to control diatoms, new herbivores for controlling Bryopsis and other hair algae, and also new herbivores that eat Valonia. It is written by Julian Sprung.