Chlorodesmis is a matting green algae that resembles a thick green turf. Unlike species of nuisance turf algae, this algae is easy to peel off rock. It requires intense light and prefers vigorous flow. This algae can be used as a habitat to breed copepods that love to breed between the dense turf of algae. This product is for a piece that is approximately 6 square inches. Or 3 inches by 2 inches.