Newbie 75 gallon

[gregzz4]

Haven't been following your build closely, but just saw what you posted ...

Nitrites 5.0
Nitrates 10.0

Your tank is empty right now, yes? If so you are on the right path. Whatever you have been doing to add ammonia needs to be stopped and you need to see the Nitrites drop.
Hopefully when the NO2 drops the NO3 will also drop.
Ideally, when the NO2 goes away, the NO3 will come down/go away too.

Sorry I haven't been following your build. I gather you're getting ready to add critters?

If you can keep adding your Ammonia product without your NO2 showing up, and without seeing any significant NO3, you can keep it up until you are ready to start adding critters.