Red or beard algae: The most difficult algae to get rid of, ... Causes of Algae in Aquariums. Algae are plants and thrive in environments rich in water, light, and nutrients.

Learn More › Black algae in a pool is not just unsightly. Although it isn’t harmful itself, it can spread rapidly and harbor dangerous bacteria, like E. coli, that can make swimmers sick.

Brown algae is a common problem in many fish tanks, especially those that have been recently set up. It’s not dangerous to fish but can turn your beautiful aquarium into an ugly mess.

We’re cleaning pros – how to get rid of algae in your paddling pool and keep it clean WITHOUT refilling it. If you click on a link in this story we may earn affiliate revenue.