I bought this at a Petsmart today. It was floating in one of their "plant tanks" and I haven't been able to determine exactly what type of sword this is. (I've had suggestions of red melon or kleiner bar on another forum.)
Thanks! I trimmed off the longer yellowing leaves and just left the darker center. I put it in my 20H tank right now until I can figure out exactly what I have. It might get moved to my higher light 45 gallon tank later.