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leaves are "curling"

I just noticed that the leaves on some of my H. polysperma are starting
severly curl all around the edges.  The leaves lower in the tank don't
appear to be suffering, but the ones in the top three inches of the water
column are definately affected. (BTW: the affected leaves are directly in
the path of the outflow from the whisper2 filter.)  What would cause this?
Thanks, Daniel