Hi everyone, I posted a few days ago about my sad experience loosening all my fish and I thought I had tank back to stable. Well it's not . I did a 50% water change per advice given here , next day Nitrites were really high again, off the chart ! I did another water change yesterday , about 45% , 15g to a 36g tank. It's climbing again this morning. I picked up a liquid test kit , was using strips before to be sure I'm getting more accurate readings thanks for that advice. This is a new tank for me and I'm getting back into the hobby after a long time and trying to learn how to do it right for a community tank. Trying to understand this "cycle" and what to do and how long it lasts and how not to kill any more fish. Do I keep doing water changes ? Tap water is very hard and has high pH , no signs of ammonia, nitrate or nitrite. Is there a better conditioner I should try , almost out and need to pick up some today. Should I add some bacteria ? All help is much appreciated.