That's a lovely big healthy type of sword![]()
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Sorry, only joking...but it's lovely.
Based on what I see, the way the veins come off the mid-rib in the leaves, I am guessing the Broadleaved Amazon Sword (Echicodorus bleheri). Don't kick me if I'm wrong though! It's hard sometimes to tell from a photo.
The Broadleaf is supposted to have broad leaves...thus the name.
Can you maybe take a couple of more photos that show more leaf and stalk detail?
Excellent. It's a hybrid. I have to admit I don't know which two swords they crossed to make it though but it's a cultivated variety which often means an easier plant to care for.