Yup....Swords are nutrient gluttons. Pretty plant !
That's VERY evident in their root systems! Last year, when my uncle and I tore down his 40G, man, that Amazon sword's mass of roots must have extended through half the tank! Swords are heavy root feeders, I don't know if they even absorb fertilizers through their leaves. Your sword will appreciate a root tab!
If you have it, turn to p.132 of Aquarium Plants: The Practical Guide. That Echinodorus x. "Rubin" looks a lot like your plant.