Subwassertang, also known as Süßwassertang, is a popular, low-maintenance, and versatile aquatic plant for freshwater aquariums that resembles seaweed. It is a liverwort, or technically a fern, that doesn't need to be rooted in the substrate and can be left to float or attached to hardscape like rocks or driftwood. The plant provides excellent hiding spots for fish fry and shrimp, while also helping to improve water quality by converting toxins and heavy metals into safe organic compounds. 
 
You will receive a golf ball sized bunch of this plant.