I was looking through my plants today for any signs of bad juju and noticed a lot of my older, very tall leaves have this (sucky pictures, so sorry):
Out of water:
They are transparent spots, but not holes. Basically, all of the color is gone, and whats left is a clear film.
I was thinking deficiency, but all of the new growth looks good. So, maybe they are burnt? They are so tall, they are inches (yes 2-3 inches) from the fixture. Heres a reference:
Should I prune em? :| Ahhh