Algae is one of those things that every aquarium keeper encounters sooner or later. Most folks don’t like algae in their tanks, and that’s understandable. It covers the glass, fogs the water, smothers plants, and other terrible things. My own view is that algae can be just as beneficial and attractive as plants in an aquarium, if it is kept under control. Dealing with an algal bloom can be frustrating, even for experienced aquarists.