How Much Nitrite Can Fish Tolerate in the USA
Nitrite levels above 0.75 ppm in water can cause stress in fish and greater than 5 ppm can be toxic. Nitrate levels from 0 – 40 ppm are generally safe for fish. Anything greater than 80 can be toxic. How much nitrite can fish handle? Under certain conditions, even relatively low nitrite levels of 0.25…