Nitrite levels remains at 0.3 mg/l (ppm) for a longer time
I have a problem with my aquarium: The nitrite level does not go below 0.3 mg/l (ppm) since I added fish after an approx. 4 week activation period; the test unfortunately still changes its color. I already carried out partial water changes, but the value does not go down. I did not find a dead fish.
the nitrite peak may indeed occur or be present later than after 4 weeks; using a really highly active filter medium (sera siporax) and a biostarter (sera bio nitrivec) will improve the situation in that case.
Dr. Bodo Schnell