I like never have nitrates or really nitrites in my tank? I've had my tank up and running for like 2 months now and about 3 weeks with fish and according to the color card on my liquid tester not enough to bump it up to the next color block. Is this a problem? Should there be some? Ammonia I've had trouble with in the past (i.e. last time I had my tank up) and had to work very hard to get it down and I've never noticed Nitrites either except once recently. Could there be a problem with my test supplies?? I know when I was using the strip method my results were way off from the pet store, but since I switched its been better. Ideas??