Just easily put into your tank, everyone can easily change the plants you want and creat your own style of aquascape. without any injury, plants can live well in a proper circumstance. does NOT cause Algae Problem. Ancient Japanese Good Luck Marimo. Just Change Water Once a Week! Dark, Lively Green Marimos that are Clean & Healthy! Can be cut into Smaller Pieces 100% Live Arrival Guarentee sold execlusively by Vanilla Bean Kings. The moss grows slowly, so this moss ball is 8 to 15 years old .Offer a free water quality record card, that help you to know well for tank water quality.