You haven't had that sword in your tank for a long time, have you? It looks like it's still adjusting from the emersed growth to the submersed, ie. the leaves with spots or withering are emersed leaves and there is new submersed growth in the center. This is common and you can just prune off the old ugly leaves. The new growth should be ok.
Any root tab fertilizers would help the sword if you don't do much fertilization otherwise.
New reseach on the Echinodorus & Helanthium in cultivation published in 2011 in the article
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