As some may know i have had quite the time with my tank It is now over 2 months and the fish are great and the test levels are fine with exception to the nitrites which are over the danger level. The thing is the fish love it. They are colorful eating playing etc. I have been doing water changes etc for a few weeks. Nothing changes. Is it possible to get a bad test kit I am using the strip method. Nothing is getting the level down but nothing seems to be wrong the way it is. How much water should I change out this weekend?