I didn't even see it in there! Glad to hear it bounced back, they do seem to be pretty resilient! Well, eventually you're going to need at least a 55 gallon for that Nymphaea.
The leaves in my tank get around 5-6" and in my 29" tall tank, the leaves get up to 16-20" pretty quickly. The good news is, you have an excuse for another tank.
You can trim the leaves back (as I do) to keep them from always reaching the surface but they will still outgrow your 10 gallon sometime in the near future.