Used responsibly, various macroalgae species of the genus Caulerpa can be ornamental additions to a display tank or help control the nutrient load of a large reef tank. 
Caulerpa are fast-growing green algae with fronds (leaf-like structures) that come in a variety of shapes. The fronds are between 6 to 12 inches in length and are attached to long runners (stem-like structures) called rhizomes. Besides simply spreading outward, Caulerpa can also propagate itself vegetatively through sections of rhizome that break off the parent plant and become established elsewhere.
Caulerpa rhizomes are attached to the substrate by fine hair-like extensions known as rhizoids. As is the case with all algae, the similarities between rhizoids and the roots of true (vascular) plants such as seagrasses are misleading; rhizoids only anchor the algae in the sediment and play no role in absorbing mineral nutrients. Caulerpa, like all algae, absorb the minerals they need from the water via their leaves.
Caulerpa are found in a variety of shallow-water marine habitats. Substrate types vary from solid rock to sand and mud, and Caulerpa can be found in both calm and rough water areas. Because of their adaptability and the ease with which they can propagate themselves vegetatively, Caulerpa can be a highly invasive species.
Caulerpa ProliferaCommon Names: Feather algae, fern algaeLighting: Low to moderateFlow: Moderate to heavyFronds: Dark-green, segmentedNotes: Grows short fronds in heavy flow, larger ones in low-flow conditions
You will recieve between 10 leaves on runners