Planted Tank Obsessed
Join Date: Nov 2007
Location: santa clara, CA
Actually, fish don't actually need a nitrate level of 0 as you can't keep nitrate level stay at 0 in a non-planted tank. If you test nitrate level in a non-planted tank, you found nitrate reading at 0, I would say there is something wrong with your water or your test kit.
Nitrate is not toxic, fish can do fine with high level of nitrate, i don't know how high, below 100ppm maybe. It all depends on which fish native to which environment.
I will exclude shrimp as I don't keep them before.
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