My point is though that as your water is treated with chloramine your ammonia spike will never go away. Every time you do a water change, forever (or at least as long as your water company continues to use chloramine), you will get an ammonia spike because your water contains ammonia.
Should that ammonia level be detectable? I tested my the water from the jug today and it didn’t show any ammonia at all. It was treated last night after the water changes with API Tap Water Conditioner.