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Care of damaged leaves & Nitrate question

I was just wondering what the best way to deal with 
damaged leaves are.

I have some leaves why have holes in, or have been
chewed a bit. Is it best to just cut off the whole leaf
(provided there are other leaves to photosynthesize 
with) or just the half of the leaf that is damaged?

Also, how come a tank can end up with 0 nitrates
if it's well stocked with fish? Does this mean that the
plants are using it all up. (I've just started a
Green Light stump remover dose to start to build
up the nitrate). But ever since I started my tank
it seems to have always had 0 nitrates.