An established tank should have 0 nitrites. If nitrites are not at 0, then
the tank has not completely cycled. Nitrites in my humble opinion are a
problem no matter what, as long as it shows on a test. All this of course is
just my way of thinking.
Fernan
"David Burton" wrote in message
. uk...
All,

Okay, Nitrites should ideally be 0.0 mg/l but at what stage do they start
becoming a problem or possibly fatal to fish and corals in the tank alike?

I would be very grateful for some kind of reply as I am getting alot of
conflicting points of view on the subject.

Thanks,
David