20pcs Giant Marimo Moss Balls 0.6"~1.2" (Cladophora aegagrophila) Live Plant Freshwater Aquarium ***Offer a free water quality record card, that help you to know well for tank water quality.*** Easy maintenance aquatic plant Cladophora aegagrophila is a 'decorative' ball of algae slowly formed over time. Normally found in cold rivers and shallow lakes, where regular wave movement forms the algae into a sphere. In an aquarium, spherical shape must be maintained through regular turning. It can be divided into smaller pieces, which become spherical over time. Carpet can be formed with Cladophora aegagrophila if attached to wood or stone. Helps absorb excess nutrient in tank water. Great aquascape decorator. Marimo Moss Ball (Cladophora aegagrophila)  X 20 PCS Diameter Size 1.6~3cm (0.6"~1.2")