nitrite problem or test problem
i have a problem, just put in a new external filter (xp2) in my 22G. The ammonia and nitrite levels increased as expected and then plummeted after several hours running. i always test regularly and recently bought a new nitrite test kit.
I now get a 0.1mg/l reading constantly and can't get it any lower?? for comparison i tested my tap water and got the same 0.1mg/l??
is it possible that i've just got a dud test? before on the previous test pack i was able to get a zero reading no problem! i am using the nutrafin test kits.