Well

(sorry I'm chuckling) but 1.0ppm nitrItes is hardly high for a tank that is at the tail end of cycling. Crud, I've had my tank cycled for well over a year and just recently went through heck trying to get it down to 1ppm!!
General rule is that you don't want to add any more fish until nitrItes are down around .25ppm OR LESS!!! So I would wait just a few more days before adding 1 more fish.....then repeat that process when buying another. It's always a good idea to wait until nitItes are almost perfect or right at 0ppm.
Your nitrAtes went up to 80, which is a good thing. This indicates that you in FACT ARE STILL CYCLING and you are on the downhill slope of it. Your nitrAtes developed quickly and they will bring those nitrItes down in no time!!!! NitrAtes are what keep NitrItes in check
You see, the reason it's so important to wait is because if you have a slight nitrIte problem.......or aren't done cycling..........and you go out and buy another fish, that fish very well may raise your nitrItes 1 or 2 points.....so instead of 1ppm you could be looking at 3 or 4ppm in a couple of days, ESPECIALLY in smaller tanks, and this is where it starts getting very deadly for fish and even plants!!!!
I just recently went through a TREMENDOUS nitrIte and ammonia spike. I mean, it was bad...........my Ammonia was up aroun 5ppm and my nitrItes were over 10ppms for about 1 week!!!!! Reason being is that I got rid of half of my gravel in my tank (thus removing 50% of the "good" bacteria

) My fish, toward the end, were appearing to have a few burns on them!!!

)

I felt SOOOOOO bad, but they all lived through it.....even the baby cory cats that I had just bought before doing this ENORMOUSLY STUPID THING!!!!!!!!
Good luck!!!!!