What is Caulerpa?

Caulerpa is a type of saltwater macroalgae. They are often used in saltwater aquariums to combat microalgae. They are known to be one of the most aggressive macroalgae in the aquarium in terms of growth and thus the uptake of nutrients. In recent years the use of Caulerpa has been dwindling due to their unstable nature. When Caulerpa is stressed due to low lighting or lack of nutrients it will often break apart and disintegrate in the tank. The use of Caulerpa is now commonly replaced by a much more stable macroalgae called Chaetomorpha.