Ziggy: The levels of NO2
you are posting refers to fw
fish and depending on the species can range, in regards to NO2
poisoning, from .10-200mg/l and depending on prolonged exposure. In general, for fw
fish, values should read below .10mg/l through basic test kits. Sw
on the other hand, 90mg/l+ would be required and once again depending on species and exposure timeframes. Most aquariums are going to have sufficient bacteria to convert NO2
; however, it would take quite a bit to impact greatly. At .05 this simply is not the case.
Melosu: See above regarding NO2
. Either the quote you gave was for fw
or implied for such or just plain incorrect.
Here is a basic article on it: Nitrite and the Reef Aquarium by Randy Holmes-Farley - Reefkeeping.com
You can also check Noga and Untergasser as they also reference past works stating the same.