Following up on this old thread. Looks like it was emersed growth, because all the original leaves have moulted off, and I'm getting lots of new growth.
The new leaves are about 6" tall now, and very healthy looking. The only thing I'm not sure about is that they seem a bit krinkly. Is this normal for new sword plant leaves?
Anyway, thanks for all your help. I probably would have thrown the thing away without it. Now it looks like its going to be a real centerpiece for my tank.