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random question

::yawn:: well the apd has been boring for a while and i just wanted to ask a
random question.  i was talking to someone on aol yesterday and he had this to
say about having a nitrate of 10 ppm-

<<<<Also, the nitrate levels in natural eco-systems (be it the Amazon River or
the tropical reef) are near 0 ppm.  A well-balanced ecological system will use
nearly all of the available nutrients.  Excess nutrients is an indication of
an out of balanced biological system.  10 ppm of nitrate would only be found
in polluted waters.>>>>

is this true?? ive heard some people say that zero nitrates in a planted tank
isnt necessarily a good thing and a nitrate level of 10 ppm or less is good
for the plants.