my new set up is up and running for about 3weeks not. My nh3/nh4 is at 0 and no2 is at 2.0 I was able to lower high level of nh level down within 1week and nitrite level still is at 2.0 (same for 2weeks) I've 1 small fish and 10 turbo snails and 6 hermit crab in it. Also, how often do I clean...