Grape Caulerpa is a great addition to any refugium. As with any macroalgae, grape Caulerpa requires nitrates and light. Grape Caulerpa grows very rapidly. It is recommended that, if introduced into an aquarium, there are fish and/or inverts that will eat the Grape Caulerpa, such as rabbitfishes and tangs. The Grape Caulerpa we are offering for sale is a small starter strand 3-5 inches, it grows quickly in the right environment so this size will be sufficient. May attach strand to small piece of rock rubble with a rubber band.