IME it's unusual to get an nh3
reading so soon but it's possible. I agree if it's smelling already then it could be higher. nh3
test kits go bad also (typically after a year) so if you bought it at your lfs
then it could have been on the shelf for a while.
Do you have good circulation in the tank during your cycle? How many raw shrimp did you use and what size are they? 2 large cocktail shrimp or 3 medium sized shrimp is more then enough to cycle a 55 gal
and even then you may have to remove 1 once your nh3
spikes above 3 ppm