The last thing you want to do is start over. All ammo-lock does is help make ammonium out of ammonia and benificial bacteria can still use it. If you have the right test kit, the pH version might have a little chart on it that you can use to tell how much ammonia and ammonium are in the water collectively. I am pretty sure that only some test kits will detect ammonium so don't be misled too easily unless you know yours will or will not.