In nature, the Mangrove plant grows in brackish water, providing a safe haven for newly hatched fry (baby fish). The plant absorbs salt water, and is able to extract freshwater for growth. A benefit is that it will hold silty soil in place, and act as a filter as water runs through its roots toward the neighboring reefs. Some reef keepers grow these in their systems to help decrease nitrates while providing an attractive plant to their display. The leaves must not touch the water. These two shoots were planted in the refugium of my 55g reef. They are slow growing tropical plants.