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The speed that any NH3 is removed by your system will be a good indicator of aquarium filter and bacteria health.
NH3 is the most toxic thing in your aquarium and much more dangerous than nitrite which is second stage in the maturation cycle.
If you have been fishless cycling, we would really recommend using a new seneye slide when you add fish after your final water change.
Commercial Ammonia is a very powerful oxidiser and can do strange things!