Cladophora aegagrophila or moss balls are balls of algae that grow 3-10 cm wide. They are a popular decorative feature to many tanks. They occur naturally in both Europe and Japan. Naturally occurring C. aegagrophila are located in shallow lakes where the movements of the waves and currents not only help form its spherical shape but also helps it receive the sufficient light it needs. Within an aquarium the C. aegagrophila must be rotated on a regular basis in order for it to keep its shape. It can be divided into smaller segments. C. aegagrophila require medium to high light intensities.