I can't believe i missed this whole thing ***) But actually that was a little sarcastic.
The original poster asked: Can nitrate kill? The first thing that came to my mind was, well it depends how high?how long has it been like that high? and this was when i first read the THREAD title.
But as soon as i read the post then i realize that Nitrates weren't a Factor.
I think the pourpose of the Post was : What killed my fish?
I have no clue why it was even a big deal.
When i said it had to be like 200 to kill. I didn't mean you can run Nitrates at 100 with no problem.
But in this case, sorry but NITRATES didn't Kill