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Lace like leaves

Hi Everybody,

I have a healthy stand of giant hygro in my aquarium that I regularly prune
and take to my LFS. The last three batches I have taken have gone through a
strange change. All of the older leaves become lace-like... full of a
network of holes. They apparently do this quite quickly... too quickly for
it to be something eating them. The tanks the cutting are put into don't
have as much light as mine but they have enough light. They use DIY CO2 and
fertilize plus they have Terralit in the gravel (same as me). They have
tested water and found nothing out of wack. They tried it in another tank
with calcium and magnesium (which the first tank lacks) but got the same
thing happening. Anyone know what would cause leaves to do this? 

in Vancouver