Comments: Uruguayensis Sword is the one sword I have had the most trouble growing. It needs brighter light then other swords. I think this sword is more sensitive to low potassium levels. I have seen this plant melt down in hours. The plant in the photo is the first one I have ever grown this big. Its in my 75gal with Eco-Complete substrate. The tank has 3w/gal 9325K GE CF. This sword desn't like to be crowed.