Good substrate will promote growth, and when there is a shortage of micro-nutrients new leaves will become pale, for that reason fertilizer is important for this plant. Generally, Sword Melon Pot (Echinodorus Osiris) is an undemanding plant, that is suitable for both soft and hard water. The red color of the leaves grows stronger at better and brighter lighting conditions. It used to be sold as E. rubra before, and isn't eaten by herbivorous fish.
