Ok I'm gonna take a shot here....
Someone correct me if I'm wrong.
If your tank is empty and running, meaning filter, heater, lights whatever. Your beneficial bacteria will die off if there isn't any ammonia source.
You need to add an ammonia source to start the cycle. Or you can do a fish in cycle.
I cycled my 55 gallon cichlid tank with fish in. It can be done if you test often and are willing to do water changes often.
Your ammonia is 0 because you have no source of ammonia in your tank.
Please can you give more informative answers so we can help you along. It would benefit is both if your posts have more substance to them.
It's hard for is to answer and help if we really don't know what the bottom line is.
Stocked or not?
What are your goals?
Please try and answer the questions.
EDIT: just saw Mummas post. So I'm correct about the BB(beneficial bacteria)
"When creating an aqua scape, strive for the beauty of imperfection, as its art and there is no wrong or right, it's left open for interpretation" James Findley