OK about a week ago my Ammonia and Nitrite levels were both high at 5ppm. I just tested my water tonight and my ammonia is now at 0 but my Nitrite is still at 5ppm. Is this the normal cycle of my new tank? I have a 10 gallon tank with one fish in it, it has been cycling for a couple of weeks now. Anything I should be doing to address the Nitrite?